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Old 09-22-2010, 08:04 PM   #1
1985LT1_C10
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turn on headlights and gas gauge goes to zero

just did a motor swap and now when i turn my headlights on my gas gauge goes to zero and my dashlights are non-existant and my buzzer goes off.....anyone have a clue as to what i did or didnt do????
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Old 09-22-2010, 08:14 PM   #2
GMC Guy
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Re: turn on headlights and gas gauge goes to zero

is it just your gas gauge that stops working?
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Old 09-22-2010, 08:22 PM   #3
nbpro
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Re: turn on headlights and gas gauge goes to zero

Sounds like a loose wire somewhere. Ground or something. Either that, or you're getting bad bad BAD gas mileage. Lol (Christine, relatives maybe?)

Last edited by nbpro; 09-22-2010 at 08:25 PM.
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Old 09-22-2010, 08:28 PM   #4
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Re: turn on headlights and gas gauge goes to zero

I would second the ground issue as you have a high resistance somewhere. You can still have good voltage but as son as you have current that voltage will drop quick with a high resistance connection such as a bad ground from the chassis to the cab.
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Old 09-22-2010, 08:29 PM   #5
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Re: turn on headlights and gas gauge goes to zero

Quote:
Originally Posted by Buick455 View Post
I would second the ground issue as you have a high resistance somewhere. You can still have good voltage but as son as you have current that voltage will drop quick with a high resistance connection such as a bad ground from the chassis to the cab.
Bingo, this is clearly the issue.
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Old 09-22-2010, 09:45 PM   #6
1985LT1_C10
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Re: turn on headlights and gas gauge goes to zero

yes its only the gas gauge.....ill go over the grounds as that seems to make sense thanks guys!
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Old 09-22-2010, 09:54 PM   #7
nbpro
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Re: turn on headlights and gas gauge goes to zero

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Originally Posted by 1985LT1_C10 View Post
did a motor swap and now when i turn my headlights on my gas gauge goes to zero and my dashlights are non-existant and my buzzer goes off.....anyone have a clue as to what i did or didnt do???? !

Quote:
Originally Posted by 1985LT1_C10 View Post
yes its only the gas gauge.....ill go over the grounds as that seems to make sense thanks guys!
humm what happen to dashlights are non-existant and buzzer goes off
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Old 09-22-2010, 10:39 PM   #8
1985LT1_C10
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Re: turn on headlights and gas gauge goes to zero

im looking at schematics right now....it seems that i must have something crossed as well .....i installed a new headunit and i hooked everything up prpoerly so i think....guess ill pull that out and take another look
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