Hello all
I have no voltage at the coil and the ignition light will not illuminate. As a result, whilst the engine will turn over on the key, the engine will not start. The engine will start using a hot wire from the battery, however.
All the terminals at the multiway positive connector at the fusebox are conducting between themselves as expected. The ignition brown wire mod is in place.
Working forward from the battery, I can see 12v at the brown wire as it enters the ignition switch, ie on the switch pigtails, by probing the wire through the sheathing (I cannot seem to get to the terminal with the lock attached though).
I therefore need to see if there is voltage at the start of the red/black wire, (that Haynes shows as exiting the ignition switch and which then goes to Pin 2 of connector O on the fuseblock -embossed however as connector N), at the connector immediately after the ignition switch.
I do not see a red/black wire within the pigtails that enter/leaves the ignition switch, so I conclude that the red/black wire must be spliced to the blue/black wire (per the Haynes diagram) at a connector that I cannot see from below the steering column.
Anyone know where that connector is located?
Moving forward along the red/black wire from the switch to the fuseblock, I do not have voltage at the red/black wire at connector embossed N/Haynes printed O, at the fuseblock, but rather my Powerprobe tells me it is earthed out, which seems odd (this earth-out is not located at the points or via the tacho because I disconnected the green and pink wires from the coil to the distributor to test this).
I do not think I have tested (with battery disconnected) continuity between brown wire at the fusebox feed terminal and red/black wire at connector N/O) with the ignition key set to Run, so as to test the switch, but will do so to verify the operation of the ignition switch.
As red/black wire is not receiving 12v, the clock, heater blower, ignition light etc, and others fed via various fuses from that wire, including the pink 12v supply to the coil. Why is that?
If I apply 12v to the red/black wire using the Power Probe tool, there is no difference, ie still no operation of the items powered by the red/black wire.
Again, I cannot remember if I applied 12v to the red/black wire’s terminal on the fuseblock (N2) though, to see if the blower, clock etc operate….I will do so in next weekend session.
There is no voltage at the back of the pink wire at fuseblock embossed connector B8 (Haynes Q8) and again the Power Probe seems to indicate that it is grounded out.
I do have continuity between the .pink wire at the fuseblock and the same wire at the coil.
Adding all this together, I seem to get to the conclusion that I have a short to earth (rather than an open circuit) somewhere in the ignition circuit. But if that is correct, I do not understand how a direct hot wire to the coil allows the engine to run?
Am I correct in thinking that the only way I am going to narrow down this short (iof that is what it is) is by seeing if I have continuity to earth (battery disconnected, all intermediate connections disconnected) between each connection in the ignition circuit and earth?
I hope it isn’t the ignition switch as I do not fancy getting that off: both security bolts are sheared off as they are supposed to be.
Thoughts and magic wands welcome
Cheers
RDS
I have no voltage at the coil and the ignition light will not illuminate. As a result, whilst the engine will turn over on the key, the engine will not start. The engine will start using a hot wire from the battery, however.
All the terminals at the multiway positive connector at the fusebox are conducting between themselves as expected. The ignition brown wire mod is in place.
Working forward from the battery, I can see 12v at the brown wire as it enters the ignition switch, ie on the switch pigtails, by probing the wire through the sheathing (I cannot seem to get to the terminal with the lock attached though).
I therefore need to see if there is voltage at the start of the red/black wire, (that Haynes shows as exiting the ignition switch and which then goes to Pin 2 of connector O on the fuseblock -embossed however as connector N), at the connector immediately after the ignition switch.
I do not see a red/black wire within the pigtails that enter/leaves the ignition switch, so I conclude that the red/black wire must be spliced to the blue/black wire (per the Haynes diagram) at a connector that I cannot see from below the steering column.
Anyone know where that connector is located?
Moving forward along the red/black wire from the switch to the fuseblock, I do not have voltage at the red/black wire at connector embossed N/Haynes printed O, at the fuseblock, but rather my Powerprobe tells me it is earthed out, which seems odd (this earth-out is not located at the points or via the tacho because I disconnected the green and pink wires from the coil to the distributor to test this).
I do not think I have tested (with battery disconnected) continuity between brown wire at the fusebox feed terminal and red/black wire at connector N/O) with the ignition key set to Run, so as to test the switch, but will do so to verify the operation of the ignition switch.
As red/black wire is not receiving 12v, the clock, heater blower, ignition light etc, and others fed via various fuses from that wire, including the pink 12v supply to the coil. Why is that?
If I apply 12v to the red/black wire using the Power Probe tool, there is no difference, ie still no operation of the items powered by the red/black wire.
Again, I cannot remember if I applied 12v to the red/black wire’s terminal on the fuseblock (N2) though, to see if the blower, clock etc operate….I will do so in next weekend session.
There is no voltage at the back of the pink wire at fuseblock embossed connector B8 (Haynes Q8) and again the Power Probe seems to indicate that it is grounded out.
I do have continuity between the .pink wire at the fuseblock and the same wire at the coil.
Adding all this together, I seem to get to the conclusion that I have a short to earth (rather than an open circuit) somewhere in the ignition circuit. But if that is correct, I do not understand how a direct hot wire to the coil allows the engine to run?
Am I correct in thinking that the only way I am going to narrow down this short (iof that is what it is) is by seeing if I have continuity to earth (battery disconnected, all intermediate connections disconnected) between each connection in the ignition circuit and earth?
I hope it isn’t the ignition switch as I do not fancy getting that off: both security bolts are sheared off as they are supposed to be.
Thoughts and magic wands welcome
Cheers
RDS