1987 K5 LS swap, couple weeks into driving the truck my battery died, found a major battery draw when the the truck is off (6-7 amps on the ground) so far traced it back to the power lead going to the fuse block, pulled all fuses didn't make much difference other then when I pulled the dome and courtesy lights. Could this be a fusible link, no blown fuses, disconnected my blower fan and relay didn't make any difference, any help would be appreciated

 

What do you mean, "didn't make much difference other then when I pulled the dome and courtesy lights"? Did pulling their fuse stop the drain?

 

Sorry no it reduced it by approx. 1 to 1.5 amps but that was over an above the 6.5 amp draw, once I opened the doors the draw increased to 7.5 to 8 amps

 

OK. Is there another fuse box that's fed from that lead that does not go through the fuse box you're working with? You should be able to pull all of those fuses and eliminate all draw.

 

No it has the stock blazer fuse block, it does have a small block that came with my new PCM wiring harness for the main power and duel relay, I will check these and see if it makes any difference. When I wired the truck I came off the starter with a large gauge fusible link to a buss bar, from there I ran to the main fuse block, then wired my electric fans, power window relays etc directly to the buss bar. I removed one wire at a time from the buss bar until the amps dropped and that was how I found what wire was causing the issue.