instrument cluster stopped and not charging

[snowball]

Hi all,

I'm having trouble with my 90 burb. The instrument cluster went a couple of days ago, figured it was a ground issue, then the truck had a hard time starting.

Batt was at 11.9 jumped it and the voltage stayed low.

Replaced the alternator. same problem.

Checked the fuses and the gauge/idle fuse was bad. replaced it, turn the key to on, gauges worked for a second and popped the fuse again. Never started the truck.

With the fuse removed, the continuity sometimes shows a quick short on the fusible wire behind the alternator. It beeps for a split second if it tap directly on the wire. If I open the door it shows a short.

Anybody seen this before?

Anybody has a good diagram? it looks like that fusible link goes straight to the fuse box.