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What's a Nopel?
353 Posts
Discussion Starter · #1 ·
I posted this on the Classic Opels site as well, but I'm hoping 2 heads (or websites) are better than 1.

I've always known that I have some electrical woes (intermittent
radio, intermittent signals, double yellow lights on the dash lights,
blue brights light stays on, etc... ) that I was hoping to tackle this
spring, but after I started her up today, more things worked than ever
did in the two years she's lived in my garage.

The radio came on (playing oldies no less) & the most bizarre of them
all was that the fuel guage worked for the first time EVER since I had

Now I know that this isn't a page out of "Christine", but this is weird!

So now that I know that more things work in this car than I ever
thought before, does anybody have any suggestions as to where do I
start on figuring out my electrical problems.

I do have one of JJ Wheatley's Electrical schematics, but "WHERE DO I

Any advice would be greatly appreciated.
72 GT

10,409 Posts
The first thing to check when things go weird is the grounds. Every circuit needs a path back to the negative battery terminal. Most intermittent electrical problems that affect more than one thing are due to a poor ground.

Looking at J.J.'s diagram, # 2 terminal (12 ga Brown) on the Green plug (Dash harness to fuse box) is the main ground connection. Then the rest of the dash grounds connect to the back of the speedo.

Check the plug first to see if it is tight. Next stick a test light into # 2 terminal. If it lights when the key is on, your problem is either the recepticle or the main ground. if no light, the problem could be at the back of the speedo and you'l have to pull the dash panel.
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