Posted 22 March 2020 - 11:21 AM
I have a 1993 Mayfair.
When I turn the key to start nothing happens at all.
Voltage at battery is 12.65v
I have 12v at ignition switch (brown wire)
I have 12v at starter motor
I have 12v at starter relay (brown wire)
I have swapped the starter relay for a known working one (flasher relay)
I then checked the switch feed at starter relay white/red wire didn't get a reading. Then got the other half to turn the key to run still didn't get a reading. Should I be getting 12v at the switch feed when the key is turned?
Is this all pointing towards a faulty ignition switch?
Is there anything else I can be checking?
I also have a power probe thing. I have used this to also check for power and also the earth's at the starter and relay all seem ok.
Any help would be appreciated
Posted 22 March 2020 - 12:46 PM
I can't think what the back of the ignition switch looks like. I think there are exposed soldered connections where the wires go into the switch.
If the brown is live (as it should be as brown is permanent live) then use a short length of wire and touch it to the brown with one end and to the red/white wire with the other. If the starter relay now operates then the ignition switch is faulty.
Other thought, is the car an automatic? If so there's an inhibitor switch which makes or breaks the current in the red/white wire and that may be faulty.
Posted 22 March 2020 - 01:18 PM
Posted 22 March 2020 - 02:03 PM
The red/white wire to the relay will only be low current - 8 amp wire'll be plenty. However the power probe sounds ideal, never used one myself.
Posted 22 March 2020 - 03:14 PM
I have carried out the above to fault find.
Posted 22 March 2020 - 03:15 PM
So I did as you said. When I put the probe on the red/white wire at ignition nothing happened. However when I then did the same where that wire goes into the starter relay had the engine turning over.
So I'm assume it's going to be either the switch or the wiring between the ignition and the relay.
Posted 22 March 2020 - 03:18 PM
Posted 22 March 2020 - 03:41 PM
Ah now the immobiliser, it could be that if it cuts the starter motor. Can't help with that though. It sounds like a break in the red/white wire whether that's caused by the immobiliser or just a straight forward break.
Posted 22 March 2020 - 04:06 PM
Just wondering if the new cable from ignition to starter relay will work as not sure if the immobiliser makes any difference.
Posted 22 March 2020 - 04:14 PM Best Answer
Posted 22 March 2020 - 10:02 PM
Ok thanks any idea what gauge or rating the wire would need to be. I may run a test wire but when I replace ill get the same colour and cross section.
Was looking at something like this.
That'll be well up to the job.
Posted 25 March 2020 - 03:16 PM
Love learning new skills as part of mini ownership
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