Just thought of a simple tweak to my approach Jim - instead of running the relay coil negative straight to ground, you could piggy back it onto the switched positive supply to the starter solenoid.CitroJim wrote:Simon, thanks, that's a great help to see how you arranged and mounted the realy. Looks neat
With the ignition on but not in the start position the the relay coil negative will be "earthed" through the starter solenoid coil - enough current to turn on the relay, but not nearly enough to pull in the starter solenoid. (Hopefully! I'm pretty sure on the V6 the relay coil that runs the cruise control gets its earth return through the starter solenoid coil without harm ?)
However when you turn it to start there will be 12 volts on both sides of the relay coil so the relay will drop out and exactly simulate the original switch contact behaviour (eg on only in ignition and not during start) without actually using the original burnt switch contacts...
This would work with a manual fan control system too, unlike the original version of my mod which relies on the Climate ECU not to run the fan during starter engagement.