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Turn on headlights, water temp guage goes NUTS!

883 Views 2 Replies 3 Participants Last post by  Georgia69
What's up with this? Been messing with the lights (I no longer get dash lights when I step on the brakes!). All is mostly well, except this minor problem. When I turn on the headlights, my temp guage (this is a guage dash, real temp guage in a '71 Sprint) goes way past 250, like my fuel guage did before I fixed the sending unit.

Please don't tell me my printed circuit is shot; I don't want to hear that!


Cecil Hawkins
San Diego, CA
1971 GMC Sprint
The Project
All I need is time...and some $$$
"Tourist, go home! And take someone with you!"
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First of all, be sure that your headlights are properly grounded to the radiator support. Then, make sure that the negative battery terminal has a "pigtail" grounded to the fender. Clean and tighten these ground connections. On my '70 Malibu, the left headlights have a ground lug which attaches to the mounting leg bolt of the voltage regulator. Check all of these ground connections carefully, one at a time.

TC Member #1279
Original owner '70 Chevelle.
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