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11-22-2010, 06:31 PM
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#1 |
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Registered User
Join Date: Jul 2010
Location: Lafayette, IN
Posts: 621
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Voltmeter dropped to zero
Got the fuel system all straightened out a couple of days ago. Last night I went out and started the truck, when I turned the headlights on I noticed the buzzer wouldn't shut off. Also the voltmeter has dropped to zero on the readout. My question is, is there a fusible link or individual fuse on an 89 R3500 with the 454 FI that controls this?
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11-22-2010, 06:46 PM
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#2 |
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Registered User
Join Date: May 2009
Location: Sparks, NV
Posts: 913
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Re: Voltmeter dropped to zero
does it go back to normal when you turn off the headlights? this sounds like a ground issue to me, check the connections to your gauges and the ground for the main harness. should be by the parking brake pedal assembly
__________________
Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__
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11-22-2010, 08:18 PM
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#3 |
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Registered User
Join Date: Jul 2010
Location: Lafayette, IN
Posts: 621
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Re: Voltmeter dropped to zero
No, the gauge worked Sunday morning. But when I went back out Sunday night and turned the headlights on is when the "courtesy" buzzer stayed on and the voltage dropped off to nothing. I was kind of thinking ground, but the other gauges in the cluster are working. I assume they are all tied to the same ground? Either way, as long as a tornado doesnt blow through tonight, I will check that out.
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11-23-2010, 12:27 AM
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#4 |
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Registered User
Join Date: Jul 2010
Location: Lafayette, IN
Posts: 621
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Re: Voltmeter dropped to zero
Checked the grounds under the dash, everything looks fine. No broken wires or rusty connections in the interior. I think I will check the wire from the alternator to the gauge tomorrow.
I did check the alternator output while running, it was at 14.2-14.5 volts. So that is good. If it isnt a bad wire from the alternator to the gauge, I wonder if it is a bad voltage regulator? |
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11-23-2010, 01:06 PM
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#5 |
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Registered User
Join Date: Jul 2010
Location: Lafayette, IN
Posts: 621
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Re: Voltmeter dropped to zero
Figured out the reason for why I wasnt getting a reading on the gauge. Blown fuse. No idea why the fuse blew, but I will work on that as I go. The whole electrical system in the truck is pretty hacked up from the PO, so it will be a work in progress for a while.
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