Help electrical problem.....

[Moose]

Huys I need help. My 90 Suburban blows the fuse that runs the blower for the AC and the speedometer. I have replaced blower motor, both relays on the firewall and the switch. The speedometer works fine but if you turn on the air and turn it up it goes. What am I missing? Thanks /forums/images/graemlins/usaflag.gif

 

[BadDog]

A short in the blower resistor pack or the wiring harness is all I can think of...

 

[zakk]

does it blow immediately? if so, refer to Baddog's post /forums/images/graemlins/grin.gif

 

[Moose]

OK guys I worked on it this weekend now I am really confused. I checked the harness and stuff started the truck and let it run in the driveway for 15 minutes with the air on and blower on high and it worked fine. I didn't drive it around thoe. Hell I have no clue. /forums/images/graemlins/confused.gif