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Old December 16th, 2012, 09:26 PM
mattwhite
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Matt White
94 D-90
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Ignition WTF?

So my '94 has a no spark issue. In the process of tracking the problem my ignition switch fell apart (plastic separated from the metal piece). Prior to the switch falling apart the car would crank but no spark at the dist. After it came apart, I tried chasing the wires on the ignition switch. The brown wire should be 12v from the maxi-fuse in the engine bay.

Now here is the WTF part: The brown wire is not getting any voltage. But the voltage measured from the electrical connector on the back side of the maxi-fuse block is 12.4. According to the wiring diagrams this wire should run directly to the ignition switch. There doesn't seem to be any cut wires so I'm guess there's something else between the two.

Anyone have any suggestions?
Matt
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  #2  
Old December 16th, 2012, 10:02 PM
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o2batsea
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Bill Adams
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Registry
Ignition module.
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Bill Adams

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Old December 17th, 2012, 12:17 AM
mattwhite
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Matt White
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That's probably part of the issue. About a year ago, I was working on the dist. and replaced the ignition module with an AB relocation kit. Then about once a month I started to have a no spark issue (extremely intermittent). However, if you killed power from the battery it was like a reset and it would then start right up. I messed with it for a while then put the old ignition module back on and didn't have any problems until now. I swapped the "new" one back on and got nothing. Sooo, yes both could be completely bad, but the new "AB" one was working for the most part when I took it off.

Any ideas on power to the ignition switch?

Matt
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  #4  
Old December 19th, 2012, 11:12 AM
mattwhite
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Matt White
94 D-90
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Posts: 116
Mystery solved.

Apparently the maxi-fuse in the engine bay labeled "ignition" does not supply 12v to the ignition switch and starter relay. It's the fuse labeled "lighting" actually supplies power to the switch and relay.

Maybe it's one of those British things, they say hood which translates to soft top, we say hood which translates to bonnet.

And the new ignition switch seemed to solve the no spark condition. Not sure of the correlation there but it has decided to run at least.

Matt
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