I'm relatively stuck. I let a local shop work on my truck to replace the flexplate, only to discover they created a whole host of other problems in the process.

Most notably, the IGN/GAU fuse blows every time I turn the key on. It's not intermittent - it literally just fries every single time. At first, I wasn't overly concerned - the truck seemed to drive just fine, except none of the gauges worked and it would chime if I turned on the headlights. Then the battery died, and I realized (from other threads on this forum) that this circuit also controls the alternator.

Some of the other threads on this forum suggested it could be caused by a shorted wire coming from the starter. I've inspected those wires, and they were indeed exposed, but after repairing them the fuse still blows.

Another possibility i read about was a shorted O2 sensor. I unplugged that entirely (just to test), but the fuse still blew.

I'm thinking that I have a pinched wire harness between the transmission and firewall as described in this thread, but frankly, I'm having a hell of a time getting to that, and I thought I might try to pick the brains of some of the other forum goers here before I gave it a go.

 

I have a similar issue with my 93 and I never really seen a answer or fix to this. It's been a while since I messed with it but I remember there was a lot of stuff on that circuit including the transmission but like 10 other things like rear defrost and stuff totally unrelated

Mine only blows like every 4 hours and with it being a off road truck I just keep spare fuses.

I would double check around the bellhousing to make sure a wire wasn't smashed or maybe unplug the trans itself and see if the fuse still blows

Edit, found this I posted back in 2011

this is kinda a side problem im having too, my transmission has been acting up and also this fuse was blown too. heres the steps i got off identifix.com

1 locate the bulkhead connector c100 on the drivers side near the brake booster. remove the pink/black wire from the cavity b2 and then plug the connector back in

2 if the fuse still pops with the pink/black wire removed from the connector unplug the cruise controle module rear defogger switch rear defogger relay, daytime running lights instrument panel cluster and rearview mirror and retest

3if the fuse still pops locate splice s200 near the steering cloumn above the brake switch inside the wiring harness. disconnect the wires from s200 one at a time while testing the fuse

4 if the problem is gone when one of the wires is disconnected check that wire using a ohm meter to each of the devices unplugged to locate what the wire powers up and check the wire from s200 to that electrical device for short to ground.