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Battery ground strap. Porsche 924 / 944 / 911 Turbo flatnose - 477971221
477971221/1
Vehicle Group
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
Information
Battery ground strap
This OE Match battery ground strap is a replacement earth strap used to connect the battery negative terminal to the vehicle body or chassis ground point. It is designed to match the original-style function and fitment for Porsche 924, 944, and 911 Turbo Flatnose models where this part number is specified.
Fits:
Porsche 924 - 1976 to 1985
Porsche 944 2.5ltr - 1982 to 1985
Porsche 911 turbo "Flatnose" - 1987 to 1989
Diagram ref no 5 (for 911) / 10 (for 924 / 944)
This battery ground strap fits at the battery area, connecting the negative battery terminal to the body or chassis earth point. Depending on the model, it may be located in the front battery compartment or battery mounting area as part of the main vehicle grounding system.
The battery ground strap provides the main electrical return path from the vehicle body back to the battery. A strong and clean ground connection is essential for reliable starting, charging, lighting, instruments, and general electrical system performance.
Functions
• Connects the battery negative terminal to the body or chassis ground point
• Completes the electrical circuit for the starting and charging systems
• Helps provide stable voltage to electrical components
• Supports reliable starter motor operation
• Helps prevent intermittent electrical faults caused by poor grounding
• Restores the correct battery earth connection during repair or restoration
• OE Match replacement for worn, corroded, or damaged original ground strap
Battery ground straps can corrode, fray, loosen, or develop high resistance over time. A weak earth connection can cause slow cranking, starting problems, dim or flickering lights, charging issues, erratic gauges, or intermittent electrical faults. Replacing the ground strap helps restore a secure electrical connection and improves overall reliability.
When to replace
• The original ground strap is corroded, frayed, cracked, or damaged
• The battery negative connection is loose or heavily oxidised
• The car has slow cranking or intermittent starting issues
• Lights, instruments, or electrical systems behave erratically
• Charging or voltage-related faults are present
• The ground strap becomes hot under electrical load
• The vehicle is undergoing battery, wiring, or restoration work
• The original strap is missing or no longer provides a reliable ground
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
477971221
The product you are viewing cross references to these numbers
This OE Match battery ground strap is a replacement earth strap used to connect the battery negative terminal to the vehicle body or chassis ground point. It is designed to match the original-style function and fitment for Porsche 924, 944, and 911 Turbo Flatnose models where this part number is specified.
Fits:
Porsche 924 - 1976 to 1985
Porsche 944 2.5ltr - 1982 to 1985
Porsche 911 turbo "Flatnose" - 1987 to 1989
Diagram ref no 5 (for 911) / 10 (for 924 / 944)
This battery ground strap fits at the battery area, connecting the negative battery terminal to the body or chassis earth point. Depending on the model, it may be located in the front battery compartment or battery mounting area as part of the main vehicle grounding system.
The battery ground strap provides the main electrical return path from the vehicle body back to the battery. A strong and clean ground connection is essential for reliable starting, charging, lighting, instruments, and general electrical system performance.
Functions
• Connects the battery negative terminal to the body or chassis ground point
• Completes the electrical circuit for the starting and charging systems
• Helps provide stable voltage to electrical components
• Supports reliable starter motor operation
• Helps prevent intermittent electrical faults caused by poor grounding
• Restores the correct battery earth connection during repair or restoration
• OE Match replacement for worn, corroded, or damaged original ground strap
Battery ground straps can corrode, fray, loosen, or develop high resistance over time. A weak earth connection can cause slow cranking, starting problems, dim or flickering lights, charging issues, erratic gauges, or intermittent electrical faults. Replacing the ground strap helps restore a secure electrical connection and improves overall reliability.
When to replace
• The original ground strap is corroded, frayed, cracked, or damaged
• The battery negative connection is loose or heavily oxidised
• The car has slow cranking or intermittent starting issues
• Lights, instruments, or electrical systems behave erratically
• Charging or voltage-related faults are present
• The ground strap becomes hot under electrical load
• The vehicle is undergoing battery, wiring, or restoration work
• The original strap is missing or no longer provides a reliable ground
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
477971221
477971221
The product you are viewing cross references to these numbers
Price: €26.18
In stock
Related products
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Information
The new Bosch batteries with Silver Technology
Please note: due to logistic restrictions, the batteries are collection from shop only.
Length: 278mm
Width: 175mm
Hieght: 175mm
The tried and proven Bosch Silver has been completely redesigned to do justice to the high requirements of international original equipment with regard to electrical values for cold starts and capacity in a continuously first-rate manner.
The Power Control System
Uses different colour displays to report the current charge status at any time and indicates whether everything's OK or whether checking, recharging or a replacement is the order of the day.
The advantages of the Bosch Silver Technology
30 % more starting power
30 % longer life
Reliable power supply for additional electrical consumers in the car
Absolutely maintenance-free
Battery types equipped with the Power Control System continuously indicate the current charge status by means of a colour display
Please note: This battery hasn't got the programmable function as per some factory specs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A7915105XS3
The product you are viewing cross references to these numbers
Please note: due to logistic restrictions, the batteries are collection from shop only.
Length: 278mm
Width: 175mm
Hieght: 175mm
The tried and proven Bosch Silver has been completely redesigned to do justice to the high requirements of international original equipment with regard to electrical values for cold starts and capacity in a continuously first-rate manner.
The Power Control System
Uses different colour displays to report the current charge status at any time and indicates whether everything's OK or whether checking, recharging or a replacement is the order of the day.
The advantages of the Bosch Silver Technology
30 % more starting power
30 % longer life
Reliable power supply for additional electrical consumers in the car
Absolutely maintenance-free
Battery types equipped with the Power Control System continuously indicate the current charge status by means of a colour display
Please note: This battery hasn't got the programmable function as per some factory specs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A7915105XS3
99961107020
99961107021
9A7915105
The product you are viewing cross references to these numbers
Price: €159.67
+ €1,414.68 packing surcharge
In stock
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Information
Stronger power battery recommended for cars with Sat Nav, AirCon and other electrical accessories.
Please note: due to logistic restrictions, the batteries are collection from shop only.
Length: 315mm
Width: 175mm
Hieght: 175mm
The new Bosch batteries with Silver Technology
The tried and proven Bosch Silver has been completely redesigned to do justice to the high requirements of international original equipment with regard to electrical values for cold starts and capacity in a continuously first-rate manner.
The Power Control System
Uses different colour displays to report the current charge status at any time and indicates whether everything's OK or whether checking, recharging or a replacement is the order of the day.
The advantages of the Bosch Silver Technology
30 % more starting power
30 % longer life
Reliable power supply for additional electrical consumers in the car
Absolutely maintenance-free
Battery types equipped with the Power Control System continuously indicate the current charge status by means of a colour display
Please note: This battery hasn't got the programmable function as per some factory specs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99961108021X
The product you are viewing cross references to these numbers
Please note: due to logistic restrictions, the batteries are collection from shop only.
Length: 315mm
Width: 175mm
Hieght: 175mm
The new Bosch batteries with Silver Technology
The tried and proven Bosch Silver has been completely redesigned to do justice to the high requirements of international original equipment with regard to electrical values for cold starts and capacity in a continuously first-rate manner.
The Power Control System
Uses different colour displays to report the current charge status at any time and indicates whether everything's OK or whether checking, recharging or a replacement is the order of the day.
The advantages of the Bosch Silver Technology
30 % more starting power
30 % longer life
Reliable power supply for additional electrical consumers in the car
Absolutely maintenance-free
Battery types equipped with the Power Control System continuously indicate the current charge status by means of a colour display
Please note: This battery hasn't got the programmable function as per some factory specs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99961108021X
580406074
0092S40100
The product you are viewing cross references to these numbers
Price: €178.44
+ €1,414.68 packing surcharge
In stock
Information
Immobiliser Battery Switch
The simple and effective Immobilaiser and Battery Cut-Off Switch.
Fits in minutes to all battery types.
Simply unscrew the black knob to disable your starter motor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911100001
The product you are viewing cross references to these numbers
The simple and effective Immobilaiser and Battery Cut-Off Switch.
Fits in minutes to all battery types.
Simply unscrew the black knob to disable your starter motor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911100001
1000.01
100001
1000 01
The product you are viewing cross references to these numbers
Price: €11.84
In stock