Dead Ignition.

[Phil H 4]

Neil posted in 2018 in respect of Dead Ignition and looking back there seem to be post back to 2005 on the subject so this issue is nothing new.

 

Everything is dead except the horn which I understand is on a separate fuse to the ignition.

So started with the ignition switch, totally fried its a wonder it has started for so long. ( pic below)

New Switch installed.

Still nothing.

Check for power.

 

Fuses ok

Power at Alternator

Power both sides of Ammeter

Power at Starter.

No Power at Ignition switch.

 

Looking at the wiring diagram for a 72 TR6 there isn't a alternator regulator, I can't see anything else.

Given the condition of the switch, could the wiring in the loom have been effected.

The visible wires outside the wrapping appear fine.

Any direction greatly appreciated and why the switch has overheated in the first place.

Thanks Phil

 

[Waldi]

It could be that the (thick) wires attached to the column have shorted to earth. 
Waldi

[Phil H 4]

Thanks Waldi

starting point for the morning.

 

[Mk2 Chopper]

There should be a white/red wire (that connects to the starter), and brown/white (coming from ammeter) that goes to the ignition switch, the brown/white should be live at the ignition switch. When turning the ignition on to start the 12v goes to the white/red wire causing the starter to turn on. 

There is no fuse on those wires , so the burnt wiring is the result, you'll need to find where the break is and repair with new wire. The other white wires from the ignition switch power other things like the gauges (through a fuse), ignition coil and warning lamps. So where you find the problem is the circuit that's gone to earth. 

Gareth