Yes, gas / petrol MPI engines, 2002 vintage.
I get the theory but how does that work in practice ?
My assumption is that the ignition switch supplies 12 volts to the coil and to turn the engine off you cut the 12 volts to the coil.
eg If I wire say a radio
to say the ignition circuit only on one engine, how does that affect the other engine after that engine is turned off ?
The only shared item I can think if is a dual engine gateway (Navman / Northstar) which already says not to connect one of the loom wires to the plug
off the distributor on one of the engines for power anyway (will check just in case)
Maybe the Navman head
is connected to the power of the other engine (eg on the panel) but still given the wires coming into the dual gateway are engine signals only, I'd doubt they could carry any amps.
All the light circuits are off when this happens so I assume they are not the issue / cause of any leakage.
On the other hand, I might try turning off all the circuit breaker switches (eg water
, lights, trim tabs etc which I normally leave on) to see if the port engine dies just in case they were dual engine / battery wired somewhere.