Thread:

2004 Chevy Trailblazer EXT

I'm trying to get 12vlt power out of the 7-way plug. the blade at the 1 o'clock position should have constant power for battery charging in trailers.
I have no power and can't find anything in the fuse panels or owners manual on how to do this. I had a 2002 2500 HD and it had power there.
I checked the back of the plug, all the wires are in place, just can't follow them to the front of the vehicle.
Any idea's....

Originally Posted by "Flat" foot'n

I'm trying to get 12vlt power out of the 7-way plug. the blade at the 1 o'clock position should have constant power for battery charging in trailers.
I have no power and can't find anything in the fuse panels or owners manual on how to do this. I had a 2002 2500 HD and it had power there.
I checked the back of the plug, all the wires are in place, just can't follow them to the front of the vehicle.
Any idea's....

Check the underhood fuse block. It may have a dummy or no fuse for that circuit. Edit: I checked the service manual - it's fuse 32, a 30A, in the underhood fuse panel. I don't recall on that year if it actually had a fuse installed when new.

I think there is one in that slot, might be a dummy. I'll check it out, Thanks

You were right, slot 32 with a 30 amp fuse. All was there except the lead coming off the box to the harness. I found it taped up in the harness itself.
Going to rig up a plug to charge my boat batteries while towing to the water. Hopefully no more low/dead battery surprises.

I can't remember on that model year, but the wire for B+ back to the trailer connector may not be connected to anything and taped to the outside of another harness. I know we did that on the CK trucks. Seems like it was red and white (the ground wasn't connected either).