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Author Topic: Losing 2v somewhere - Ignition Switch?  (Read 170 times)
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JohnFol
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« on: June 29, 2021, 01:30:01 PM »

Afternoon all, I get ~9-10v on rear lights / wiper motor when earthing via a lead directly connected to battery -ve (so that rules out a poor earth). I get 14.1v from alternator so suspect the supply side.

I'm gradually going through the electrics and have replaced battery, replaced main wiring to starter motor / alternator / fuse box, replaced HT leads, replaced coil, refurbished starter and alternator, starter now fired by relay etc. and happy to replace / renew parts as I go along.

Other symptom is firing engine is sometimes sluggish, but sparks up really well when it turns.

I have a week off soon, so want to line up parts. Does this sound like a failing ignition switch?

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peteracs
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« Reply #1 on: June 29, 2021, 04:36:34 PM »

Hi John

To confirm it is the light switch etc, I suggest take off the steering cowling and measure the input and output voltages from the switches.

For the lights I have relays for the side/low and high beams and on Ericís suggestion will be looking to do the same on the wiper motor.

This removes the loading from the switch assembly on the steering wheel.

Peter
« Last Edit: July 01, 2021, 09:48:45 PM by peteracs » Logged

Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
JohnFol
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« Reply #2 on: July 01, 2021, 11:40:55 AM »

12.1 in, 10.3 out on Green / black and similar for starter cable...

Looks like the electrical part of the mechanism is non serviceable
Sad
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