Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Revs not going to idle

Hi Laurens, an explanation based on further investigation and info from yourself.

Fuses 7, 8, 9, 10 and 11 are all fed directly and exclusively from ignition switch, all using green/yellow wires.

With ignition off you tell me operating hazard switch fed by power from fuse 2 (purple/black wires that also feed horn) allowing all indicators to flash as normal. Unfortunately this also causes fuel pump to run and oil pressure warning to light. You also tell me that removing fuse 9 stops this unusual behaviour.

My first thoughts are that somehow power from the permanent hazard switch feed is looping through to the circuit(s) fed by fuse 9 (green wires, stalk switch and instruments) thus allowing a back feed through this fuse to all the other ignition controlled fuses mentioned above, making them all live! Fuse 10 then passes power to the engine relay coil (as it would with ignition on) and the ECU completes the relay coil circuit with a ground, energising it. This puts the permanent power feed into relay on to the fuel pump. With the engine relay energised the oil light comes on as well since engine not running. When headlamps are switched on fuses blow as all power with ignition off is passing through the 7.5 amp fuse 9.

I know this doesn't offer an answer to your issues but (assuming above scenario correct or nearly so) gives you an area of the wiring to concentrate search on. I would be looking for a failed component or wiring causing a short of permanent feed to another circuit.

ETA: fuse 10 is another possibility for the back feeding and that normally feeds the infamous TSM and flasher relay. The results would be the same.