speedsecret

On my last trip in the vette the temp gauge start to show over the 260f line. It heppen only when i turn on the lightes (in the same time the light in this gauge stop working)
When i turn off the lightes the temp gauge return to the normal operaiton temp range.
Is it the electricl card of the gauge or only the burned light bulb?

Easy Mike

Does the car actually over heat? If it gets to an actual 260, you'd know it.

speedsecret

No the actual temp is around 200/190 ...its only show over 260 when i turn on the lightes...like an electrical problem

7T1vette

Sounds like a 'grounding' problem....most likely on the electrical circuit board (if you have a later model C3). Possibly a broken foil line going to ground; the gauge (when not lit) might be able to scavenge a ground by another path.

speedsecret

I will check..thanks

SwampeastMike

Something tells me you will find a short in the printed circuit behind the gauge pack. It will be between one of the leads to the temp gauge and one of the lighting leads.

Those printed circuits tend to delaminate over time. They're moderately repairable (with patience) but my replacement (mine from Willcox) is superior to the original and reasonably priced.

speedsecret

Thanks