Hi all,
I am just going through the rewiring of my 72 S3 petrol, using a nice new auto sparks harness. At the weekend I started to sort out all the ignition switch & instrument panel....previously carefully labelling everything etc.
As part of the resto, I decided to just renew the ign switch. Below is what came off.....
After some research, I believe this to be a late S3/90 switch...part no PRC8230?
The wiring was as follows.....t1=white/red, t2=brown, t3=white, t5=nowt
Based on the parts book, I ordered switch 579085 (157sa) photo as below....
I duly wired up per green bible wiring diagram......t1=brown (only one spade connector, which is odd as wiring diagram shows multiple browns to this terminal...ie horn).....t2=white, t3=white/red, t5=nowt
All wiring checked and double checked, earths good etc.....ignition on.......no charge light or oil pressure light, turn key to fire up.....engine would fire, charge flickers, but as soon as let go key.....no more spark to coil.....plus some other weirdness.....
so I put back the original (white insulated) switch and wired back up as it came off a year ago.....all working perfectly?
This morning I tried the new switch again (brown insulation), but this time after some experimenting...t1=nowt, t2=white, t3=white/red, t5=brown......and it all fired up perfectly and the charge light, oil pressure light behaved as they should.....
so in summary.....is the new switch faulty.....ie terminals marked with incorrect nos or is wiring diagram in green bible wrong?....
Am I going mad...am I missing something here?
I am just going through the rewiring of my 72 S3 petrol, using a nice new auto sparks harness. At the weekend I started to sort out all the ignition switch & instrument panel....previously carefully labelling everything etc.
As part of the resto, I decided to just renew the ign switch. Below is what came off.....
After some research, I believe this to be a late S3/90 switch...part no PRC8230?
The wiring was as follows.....t1=white/red, t2=brown, t3=white, t5=nowt
Based on the parts book, I ordered switch 579085 (157sa) photo as below....
I duly wired up per green bible wiring diagram......t1=brown (only one spade connector, which is odd as wiring diagram shows multiple browns to this terminal...ie horn).....t2=white, t3=white/red, t5=nowt
All wiring checked and double checked, earths good etc.....ignition on.......no charge light or oil pressure light, turn key to fire up.....engine would fire, charge flickers, but as soon as let go key.....no more spark to coil.....plus some other weirdness.....
so I put back the original (white insulated) switch and wired back up as it came off a year ago.....all working perfectly?
This morning I tried the new switch again (brown insulation), but this time after some experimenting...t1=nowt, t2=white, t3=white/red, t5=brown......and it all fired up perfectly and the charge light, oil pressure light behaved as they should.....
so in summary.....is the new switch faulty.....ie terminals marked with incorrect nos or is wiring diagram in green bible wrong?....
Am I going mad...am I missing something here?
