How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
Type Your GM Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

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: 1 month ago.
Category: GM
Expert:  david craig replied 1 month 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 1 month ago.

just checking in to see how its going

Related GM Questions