Voltage Gauge flatlined

Durio · Dec 27, 2023

Took my 89 5.7 OBS Silverado out for a cruise yesterday and noticed the voltage gauge wasn’t working.. Battery tested at 12.46 and with engine running 14.47, That tells me Alternator is good. Was working last time driven. Battery is on trickle charger when sitting in garage so charge is good. Is there a fuse or fusible link for just the voltage gauge. Looking for answers before I go in and replace. Thanks

You must be registered for see images attach

Schurkey · Dec 28, 2023

Download the service manual set for your vehicle. The schematic will be included.

Jerrys1990 · Tuesday at 8:09 AM

Durio said:
Took my 89 5.7 OBS Silverado out for a cruise yesterday and noticed the voltage gauge wasn’t working.. Battery tested at 12.46 and with engine running 14.47, That tells me Alternator is good. Was working last time driven. Battery is on trickle charger when sitting in garage so charge is good. Is there a fuse or fusible link for just the voltage gauge. Looking for answers before I go in and replace. Thanks
You must be registered for see images attach

You must be registered for see images attach

Any updates? My 90 just started doing this yesterday. Cannot find the service manual.

GrimsterGMC · Tuesday at 11:35 PM

Had the same thing going on here too, from what I see in the electrical manual there is power from the key on to the gauge, then from the gauge to the back of the alternator. Mine was charging but the gauge was ready very low. When I left the key on overnight and totally flattened the battery, then recharged it the next day, the gauge started reading correctly again so I can't say what caused it to read wrong.

Voltage Gauge flatlined

Durio

Newbie

Schurkey

Supporting Member

Jerrys1990

OBS Enthusiast

GrimsterGMC

Thunder from "Down Under"

Similar threads

Latest posts

Staff online

Members online

Forum statistics

Share this page