Headlight switch - Tach issue - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

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post #1 of 5 (permalink) Old 05-07-2020, 11:19 AM Thread Starter
 
 
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Headlight switch - Tach issue

Yes I said headlight switch tach issue. LOL Over 20 years ago the owner tapped the ignition and seemingly tachometer into the headlight switch. The car will not start and the tach will not work unless you pull out the headlight switch halfway. Starting the car works great, but my tach clearly is not working correctly and jumps around like crazy. My tach is the ever popular Sun super tach II. A wiring expert I am not. Any ideas? Clean up the connections? New headlight switch? TY
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post #2 of 5 (permalink) Old 05-07-2020, 11:57 AM
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Here is a Schematic on how to properly wire the tach:

https://farm4.static.flickr.com/3206...54c35ea3e4.jpg

You need to patch your wiring to reduce the risk of fire or the car leaving you stranded on the side of the road.

Big Dave
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post #3 of 5 (permalink) Old 05-10-2020, 09:52 PM Thread Starter
 
 
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Quote:
Originally Posted by Big Dave View Post
Here is a Schematic on how to properly wire the tach:

https://farm4.static.flickr.com/3206...54c35ea3e4.jpg

You need to patch your wiring to reduce the risk of fire or the car leaving you stranded on the side of the road.

Big Dave
Agreed!!!! I will check out the ink. Thank you.
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post #4 of 5 (permalink) Old 05-10-2020, 09:55 PM Thread Starter
 
 
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I'm assuming I just wire the ignition back up without the "headlight ignition switch mod"?
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post #5 of 5 (permalink) Old 05-11-2020, 09:35 PM
BA.
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Well the tach certainly sounds like it needs re-wired, probably the ignition too but what a pretty cool anti-theft mechanism!! I love that idea.



But like Dave was implying - when that stuff isn't well thought out and properly wired, you can overload wiring, overheat it, cause a fire for that dusty 54 year old insulation crap and other wiring up under the dash. Talk about getting ugly real quick.
It would be interesting to see how they wired through the headlight switch. I assume your parking lights still work as they should?

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