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1989 G20 electrical issues #746889
April 02nd 2019 12:15 am
April 02nd 2019 12:15 am
Joined: Mar 2018
Posts: 4
Denver, Co
Denverjedi Offline OP
stranger
Denverjedi  Offline OP
stranger
Joined: Mar 2018
Posts: 4
Denver, Co
First I lost the gauges. Fuse failed and when replaced they did not come back.
It may not be related, but now it is not charging. It ran until the battery failed.

We will dig in to it tomorrow. it has to be at an event in Chicago next Tuesday.

Any suggestions what to check other than the charging?


Last edited by Denverjedi; April 02nd 2019 12:15 am.

1989 G20 "Fanboys" van in progress
Re: 1989 G20 electrical issues [Re: Denverjedi] #746890
April 02nd 2019 12:32 am
April 02nd 2019 12:32 am
Joined: Jun 2010
Posts: 14,442
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,442
Van Diego California
In line fuse to the alt N a few in the fuse box... I did the same thing in my 93 g30


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 1989 G20 electrical issues [Re: Denverjedi] #746910
April 02nd 2019 7:43 pm
April 02nd 2019 7:43 pm
Joined: Mar 2011
Posts: 346
NY
J
jcd74 Offline
enthusiast
jcd74  Offline
enthusiast
J
Joined: Mar 2011
Posts: 346
NY
I have a 89 g30 w/ 454, don't know if they have the same alt. I wasted my time following the brown wire back to the fuse block, no connection. It's for people who have an idiot light. The newer alt with a gauge is uses 2 wires. The charge wire, the biggest red one and a pink/ black stripe to turn it on. If you check for power at each wire you should have battery voltage, no drop. So if your battery is dead @ 8 volts you should see 8 volts @ each wire. If you have nothing on the pink/black check all the red wires that go into the fuse block, you should have full batt. voltage. If not follow that wire back to the fusible link and check the link. If no voltage to the largest red charge wire follow it back and do the same. Remember you still have to clear the fault, so buy at least 2 links if you replace any of them, the new one may blow until you find the fault. You said you changed the fuse for the gauges so you probably blew a link, also check all the fuses in the block as other fuses on the block branch off and protect other smaller fuses on the same block.
Note! I have a CS style alt, with a 4 pin plug that only has 3 wires coming off the plug. Be carefull with the wires on the plug, they are small and frail and will break inside and you may lose the connection at the plug if you pull it by the wires.


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