Newbie needs help, replace starter now some gauges don’t work

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gmcsprint79

Junior Member
Joined
Nov 6, 2024
Posts
1
Reaction score
0
Location
CA
First Name
Richard
Truck Year
1979
Truck Model
3500 Sierra Grande
Engine Size
350
Hi, new guy here. Just joined 2 days ago

79 GMC 3500 Sierra Grande with 350 GMC engine.
Replaced starter, now appears not charging from alternator. Checking volts at battery shows no increase with increase in revs. Lights on drops voltage with no change when rev’d.

Some gauges now don’t appear to work. Volt gauge is full left and does not move, temp gauge no movement. Oil pressure 60psi (normal) but when turn off it drops to 1/4 not zero..

The only wiring I touched was at the starter. Any ideas on what the problem could be???

I do not have an owners manual or any repair manuals or wiring diagrams. I’m definitely not an electrical expert, know just enough to be dangerous.

Thanks for any guidance.
 

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