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Old 08-27-2007, 09:26 PM
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Electrical Question

I need some help with an electrical problem.
When I pull the headlight switch on the temp gauge goes to hot. With the switch off the temp reading is normal and everything runs okay. Any ideas?
Willie496

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Old 08-27-2007, 09:32 PM
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bad ground

You probably have a bad ground. ,,current going the wrong way to find a ground can cause strange things to happen
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Old 08-28-2007, 03:19 PM
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Doc here ,

Check your rear harness going from the dash to the tails..

Chances are you have a cut in the bundle shorting the Fuel sender when the tails are lit..




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Old 08-29-2007, 11:22 PM
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My Blazer had a similar problem -- it was a bad ground to the instrument panel.

My oil gauge and my temp gauge would both change when I pulled on the lights. Ran an additional ground straight from the batt and life was good

ford2go
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Old 09-01-2007, 09:58 AM
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Electrical Problem

Quote:
Originally Posted by timothale
You probably have a bad ground. ,,current going the wrong way to find a ground can cause strange things to happen
I checked all the ground connections in the consel, and it still will not work. Even when I unhook the themostat green wire from the head the gauge still goes to the hot far right side reading.
Maybe the dash switch is the problem?
Thanks, Willie
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Old 09-01-2007, 09:59 AM
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Quote:
Originally Posted by ford2go
My Blazer had a similar problem -- it was a bad ground to the instrument panel.

My oil gauge and my temp gauge would both change when I pulled on the lights. Ran an additional ground straight from the batt and life was good

ford2go
I checked all the ground connections in the consel, and it still will not work. Even when I unhook the themostat green wire from the head the gauge still goes to the hot far right side reading.
Maybe the dash switch is the problem?
Thanks, Willie
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Old 09-01-2007, 10:00 AM
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Quote:
Originally Posted by docvette
Doc here ,

Check your rear harness going from the dash to the tails..

Chances are you have a cut in the bundle shorting the Fuel sender when the tails are lit..




Doc
I checked all the ground connections in the consel, and it still will not work. Even when I unhook the themostat green wire from the head the gauge still goes to the hot far right side reading.
Maybe the dash switch is the problem?
Thanks, Willie
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Old 09-01-2007, 09:22 PM
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Switch problems

I don't think it's the switch. More likely to be the wires in the wiring harness or ground connections.

Can you provide more detail? How old is the vehcile? Have you made any modifications recently that triggered this symptom? Do your lights work ok, are they dim? Does the gauge read hot if only your parking lights are on, or only when the headlights are on?

The problem definitely sounds like a short. The hardest part is tracking it down.
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Old 09-02-2007, 05:11 PM
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Quote:
Originally Posted by kf4ozb
I don't think it's the switch. More likely to be the wires in the wiring harness or ground connections.

Can you provide more detail? How old is the vehcile? Have you made any modifications recently that triggered this symptom? Do your lights work ok, are they dim? Does the gauge read hot if only your parking lights are on, or only when the headlights are on?

The problem definitely sounds like a short. The hardest part is tracking it down.
1969 Camaro, the only modification that I have done we eliminated the regulator by using a single wire altenator. lights work fine they are not dim. The gauge reads hot with the park lights and the headlight switch on.
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Old 09-03-2007, 03:02 PM
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Doc here,


Go BACK to where you disconnected the sender from the gauge, then ground that wire (terminal) on the gauge..with the key "On" it should drive to "Full"..

IF it does......

Your Sender wire is cut/shorted..replace it.


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