i own a 99 yukon slt. i have had it for about 4 years now. it has always had a battery over nite draining issue.i have put sevaral new batterys in it. and they dont lst long if i dont unhook the battery.everything works and no interior lights stay on.no underhood light problem.no hung relays. no noises after key turned off. when u take the battery cable loose and brush against the batt terminal wow what a spark.i know it should have a slight spark becuase of computer and radio and so on memeory issues.this is different i took the computer all the way out of the truck and it still jumps enuff spark to set off a stick of dynomite.under the hood i have taken all the relays out of the relay fuse block. i have three 50 { even if they are put in one at a time} amp fuses that will let the battery create this extreme battery spark issue.i can put all others in and leave 3 them out and i no longer get this huge spark. if i can find out what is on these 3 circuits then i should be able to find the culprit or culprits.how can i find out what these 3 circuits supply juice to? last i have tried to include all info i can not just to fill up space. in hopes this is something familar to someone. p.s. i have seen on another site that the body control modual has had an issue like this on trucks like mine. ok! where is it located i am having trouble finding it. i have a 99 villager ripped up in the drive way right now. my wife needs to be able to have a dependable way to work so i am trying to fix to different vehicals at once.
this is me! help and thanks!!!!!!!!!!!