Electrical gremlins

Paint, body preparation and modification, interior work and electrical
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Nustad 510
Posts: 41
Joined: 27 May 2010 04:40
Location: Newbury, Australia

Electrical gremlins

Post by Nustad 510 » 18 Nov 2018 02:12

Hi all,

I have a '71 510. Four door, RHD. With the ignition on all indicators work normally. When I turn on the headlights, the fender indicators partially illuminate. I also noted the speedo cable at the rear of the instrument cluster gets warm. Headlights switch between parkers, Low and High beam normally. Also the temperature gauge is now erratic when the engine is running. All fuses are intact. Fuse box has been in a vinegar bath. All harness connectors were cleaned with electrical contact cleaner and a toothbrush. Has anyone experienced this problem. Its got me stumped. Any help would be appreciated.

Cheers, Shaun.

yenpit
Posts: 1310
Joined: 07 Jul 2006 20:14
Location: Denver Colorado

Re: Electrical gremlins

Post by yenpit » 29 Nov 2018 11:18

When a metal "wire" like a speedo cable or a choke cable get hot, it's usually an indication of a GROUND issue.............exactly where is tough to pin point! Do you have a good SOLID ground strap/cable on the engine/trans?
72 510 4dr
1965 Mustang GT Coupe
2003 Saturn LW300 - wow!
LOTS of 510 parts!

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Nustad 510
Posts: 41
Joined: 27 May 2010 04:40
Location: Newbury, Australia

Re: Electrical gremlins

Post by Nustad 510 » 29 Nov 2018 19:30

Thanks for the reply Yenpit.

Further testing led me to also think it was an earth issue. I do NOT have a ground strap. :oops: Only the Negative battery cable to the engine block. I will definitely try adding one.

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Nustad 510
Posts: 41
Joined: 27 May 2010 04:40
Location: Newbury, Australia

Re: Electrical gremlins

Post by Nustad 510 » 01 Dec 2018 01:14

Hi all,

I'm pleased to say the problem is fixed. :D I ran a cable from the negative battery terminal to the body work (captive nut on the strut tower). This has provided a decent earth and now everything functions correctly. Thinking back my previous 510 had this exact setup. Somehow I didn't notice it missing on this car.

Thanks very much for your help, Cheers
Shaun.

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Edm620
Posts: 30
Joined: 06 Dec 2017 20:44

Re: Electrical gremlins

Post by Edm620 » 12 Dec 2018 07:14

Whenever there is any kind of electrical gremlin, 99% of the time it is caused by a bad ground. Glad you found where yours was!
We can't solve problems by using the same kind of thinking we used when we created them.”
Albert Einstein

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