Upgrades and 'improvements'
Push button start
Disclaimer The TVR Car Club will not accept responsibility for any damage caused to any vehicle as a result of using this information.
Reproduced with kind permission of Bob Smith
Bob's site can be found here. Some quick disclaimers:
Parts List
Momentary starter switch, pushbutton engraved alloy with blue LED from UR Motoring
Relay (RLA 1), 5A 12Vdc DPDT. From Maplin Part Number - JG66W
Relay (RLA 2), 40A 12Vdc SPST. From Maplin Part Number - AR32K
Bob's site can be found here. Some quick disclaimers:
- Please use this information and associated photographs in good faith.
- The Author does not guarantee the accuracy of the information and is not liable for use of said information.
- Ownership remains the property of the Author. The information and associated photographs must not be copied, profited by or used for commercial gain.
Parts List
Momentary starter switch, pushbutton engraved alloy with blue LED from UR Motoring
Relay (RLA 1), 5A 12Vdc DPDT. From Maplin Part Number - JG66W
Relay (RLA 2), 40A 12Vdc SPST. From Maplin Part Number - AR32K
Instructions
Based on a 1999 Chimaera.Use 18 gauge wire throughout. Access required to top of dash (can be achieved with only the two passenger side nuts removed but be careful not to over strain things). I chose to fit the switch in place of the rear guard fog light switch so I also needed access to the radio console. The push button switch will need to be ordered with an additional power switch fitted; UR Motoring can supply. I molded an additional aluminium outer ring for the switch so that it would better match the standard switchgear.
This system employs an interlocking relay to prevent accidental starting when the engine is running and to maintain electrical power once the start process is underway. This utilises the -ve signal from the oil pressure switch to let the system know the engine is 'not running'. Once the start process begins the signal from the oil pressure switch is overridden with a self latching switch within RLA 1. That way even if oil pressure is generated whilst cranking the engine the start system stays live. Once the engine is running the signal from the oil pressure switch prevents accidental operation.
The oil switch signal wire is brown with a white stripe. This wire is within a loom that enters the upper dash near centre then feeds towards the off-side. There is a spare brown/white wire lying alongside this loom probably there for a remote oil light and is unused on my Chimaera. This wire terminates with a female miniature spade connector. Use this for the 'oil pressure switch' signal.
All other connections are made in the steering wheel cowl. Link into the ignition loom on the nearside of the steering column.
Wire colour codes
Wiring Diagram
Based on a 1999 Chimaera.Use 18 gauge wire throughout. Access required to top of dash (can be achieved with only the two passenger side nuts removed but be careful not to over strain things). I chose to fit the switch in place of the rear guard fog light switch so I also needed access to the radio console. The push button switch will need to be ordered with an additional power switch fitted; UR Motoring can supply. I molded an additional aluminium outer ring for the switch so that it would better match the standard switchgear.
This system employs an interlocking relay to prevent accidental starting when the engine is running and to maintain electrical power once the start process is underway. This utilises the -ve signal from the oil pressure switch to let the system know the engine is 'not running'. Once the start process begins the signal from the oil pressure switch is overridden with a self latching switch within RLA 1. That way even if oil pressure is generated whilst cranking the engine the start system stays live. Once the engine is running the signal from the oil pressure switch prevents accidental operation.
The oil switch signal wire is brown with a white stripe. This wire is within a loom that enters the upper dash near centre then feeds towards the off-side. There is a spare brown/white wire lying alongside this loom probably there for a remote oil light and is unused on my Chimaera. This wire terminates with a female miniature spade connector. Use this for the 'oil pressure switch' signal.
All other connections are made in the steering wheel cowl. Link into the ignition loom on the nearside of the steering column.
Wire colour codes
- Ignition +ve White
- Permanent +ve Red
- Starter White/Red
- Earth to chassis
Wiring Diagram