Davedstone
Member
My first posting on this forum and I am wondering if anyone can help.
I have four Rover P6 manuals (genuine service manual) with differing wiring schematic.
I have a 1972 P6 which uses the lumenition MK12 (fitted in the late 70's) and the car was working perfectly (all gauges) so I know the wiring is OK, but since getting my car back from my mechanic who changed the (engine in situ) gearbox, the gauges stopped working. I discovered leads to the oil sender and water temperature transmitter were left off. Re-attached and smoke emitted from under the dashboard, so quickly isolated the battery. I removed the dashboard which revealed the burnt wiring. I unwrapped the electrical tape from within the inside bulkhead right through to inside the engine compartment where it splits off to the ignition coil and fitted the correct rated cable and decided to perform a static test which showed a dead short to ground on one of the cables which goes to the + side of the ignition coil. The manual shows a supply from the ignition sw pin 3 white cable to a junction (shares distribution to other circuits) then directly to the tachometer then out to the + side of the ignition coil. There is also a slightly thicker gauge cable using the same colour code which is white with a yellow tracer. Using my DVM with both leads disconnected from the ignition coil I have a dead short to ground. After some pondering and long extension leads, led me to the the starter motor which is where it takes a permanent 12 volts according to the service manual, but the white and yellow lead is connected to one side of the starter (cables look original) and when I disconnect this (joined via a bullet connector to the terminal of the solenoid) the short is removed, yet this looks like it's never been disturbed. Where should this join? Or can I just split using a double bullet connector and take a positive 12 volt supply from the main 12 volt supply to the starter motor.
Any advice, help would be greater appreciated.
Thanking anyone in advance for your reply.
I have tomorrow off and I want to make sure I am taking the right approach in resolving this anomaly.
Regards,
Dave
I have four Rover P6 manuals (genuine service manual) with differing wiring schematic.
I have a 1972 P6 which uses the lumenition MK12 (fitted in the late 70's) and the car was working perfectly (all gauges) so I know the wiring is OK, but since getting my car back from my mechanic who changed the (engine in situ) gearbox, the gauges stopped working. I discovered leads to the oil sender and water temperature transmitter were left off. Re-attached and smoke emitted from under the dashboard, so quickly isolated the battery. I removed the dashboard which revealed the burnt wiring. I unwrapped the electrical tape from within the inside bulkhead right through to inside the engine compartment where it splits off to the ignition coil and fitted the correct rated cable and decided to perform a static test which showed a dead short to ground on one of the cables which goes to the + side of the ignition coil. The manual shows a supply from the ignition sw pin 3 white cable to a junction (shares distribution to other circuits) then directly to the tachometer then out to the + side of the ignition coil. There is also a slightly thicker gauge cable using the same colour code which is white with a yellow tracer. Using my DVM with both leads disconnected from the ignition coil I have a dead short to ground. After some pondering and long extension leads, led me to the the starter motor which is where it takes a permanent 12 volts according to the service manual, but the white and yellow lead is connected to one side of the starter (cables look original) and when I disconnect this (joined via a bullet connector to the terminal of the solenoid) the short is removed, yet this looks like it's never been disturbed. Where should this join? Or can I just split using a double bullet connector and take a positive 12 volt supply from the main 12 volt supply to the starter motor.
Any advice, help would be greater appreciated.
Thanking anyone in advance for your reply.
I have tomorrow off and I want to make sure I am taking the right approach in resolving this anomaly.
Regards,
Dave