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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5787
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2004 gmc sierra 1500 Have a short in lbec 2. fuse does not

Customer Question

2004 gmc sierra 1500 Have a short in lbec 2. fuse does not blow but it has about 4.2 amp draw on system. What does that system run?. Is it a common occurrence? Also the a/c unit runs fine, then without notice it switches to heat ? what is the problem?
JA: Do all the fuses have the correct amperage for the circuits they're in?
Customer: Yes from the factory.This one says 50 amp
JA: Are you fixing your Sierra 1500 yourself? What have you tried so far?
Customer: Yes , I worked on cars in 70 & 80's. but not familiar with computerized systems. Took it to a shop specializing in electrical problems. He said the speedometer cluster had to be replaced. $770 was his estimate. The cluster looks good no burn marks on the back side
JA: Anything else you want the mechanic to know before I connect you?
Customer: that is it.
Submitted: 10 months ago.
Category: GM
Expert:  david craig replied 10 months ago.

Hi Im David, thanks for visiting the site, Under the hood in the fuse block, there are large 30-60amp fuses. Hook up your amp meter to the battery, let is stand for about 10-15mins, this will let all the computers go to sleep. If your draw is above 100mAMPs, then remove each one of these fuses to see if the draw goes down.

Make sure there are no aftermarket items hooked in to the eletrical system.

Let me know if this lowers the draw.

Expert:  david craig replied 10 months ago.

just checking in to see how its going