2012 GMC Acadia heavy spark when connecting negative terminal to batte
Trying to connect the battery and negative terminal major Sparks to post bad enough it melt the battery post
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Connect an DMM (digital multimeter - ammeter mode 10A scale) in series connection between the -ve battery lead and the battery post i.e. battery lead → Ammeter → -ve battery post and check what the current flow value is. Hopefully is it <10A
Then start removing the fuses, one by one, from the engine bay fuse box and check if the current value shown on the meter drops to approx. 50mA-80mA.
If it doesn't drop when the fuse is removed, replace the fuse and remove the next one and check. That way you won't confuse as to which fuse goes where.
When the current value drops to the usual value, find out what the fuse supplies by checking what it shows in the fuse layout diagram in the fuse box lid or this link.
If it's a major fuse you may have to isolate it further by replacing it and then removing minor fuses in the other fuse boxes (instrument panel) that may be supplied by the major one to find out what circuit is drawing too much power
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It sounds like they're probably going to blow their amp meter unless it's a heavy duty one. This sounds like more than 10A
Agreed but 10A is still a hefty current.
Current greater than that would seem to be a direct short somewhere between the +ve battery supply and earth (chassis?)
Starter motor area perhaps
Cheers
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Does this Acadia have any modifications that draw a lot of current?
door F Dryer