1987 Grand Prix Warning Gauge Cluster & Ignition

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Michael Farrell

Not-quite-so-new-guy
Aug 4, 2016
25
1
8
Carleton Place, Ontario
Hi Guys,

I have an 87 GP (Base) with the Chevrolet 305 recently it has started constantly blowing 2 Fuses on my fuse block [IGN 1 - 10 AMP (according to my fuse block) and Gauges - 10 AMP] just not sure where to start the troubleshooting process but if its any help the Ignition 1 fuse will blow as soon as the car is put into run position and and all the gauges go into bulb test but the temperature one doesn't come on until the car is started the after idling for about 2 minutes the gauges fuse will blow

any help would be appreciated
 

pontiacgp

blank
Mar 31, 2006
29,270
20,391
113
Kitchener, Ontario
your gauges take a 20 amp fuse

Fuse box.jpg
 

pontiacgp

blank
Mar 31, 2006
29,270
20,391
113
Kitchener, Ontario
I have no idea but here is the wiring diagram for the gauges which also says the fuse is 20 amps...

OptionalGagePackage.jpg
 

Michael Farrell

Not-quite-so-new-guy
Aug 4, 2016
25
1
8
Carleton Place, Ontario
the car doesn't have the optional gauge package, its only got warning lights for Oil Pressure, Temp and Voltage. only actual gauge is for fuel (thus the 10 AMP fuse) I'm suspecting after some digging previous owner rigged up a new temp sensor (1 terminal) and it may be shorting. I will post some photo's when I get back home this evening
 
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