oops if BCM brain may run that, that bad act can blow up and expensive BCM, learn to use a voltmeter
some test lamps use 10+ times ,or current that computers can source.
some PCM have
0.050 amp limits on some outputs.(oops)
have hard cold proof of that and the service manual on all cars and trucks warn of this fact.(page 1 electrics 101) or ASE class.
cars or trucks can have 2 to 4 fuse boxes, we must find them all an check them all first. (even a user guide can show where)
the peterbilt shop service manual cover all this, buy one is savvy/
BCM is body brain box. and runs vast things on the body for sure vast lamps. not saying me there is one, but 2015 is modern truck
and we have no heavy truck support here, so join peter-built forum
google it?
first google hit
https://www.thetruckersreport.com/truckingindustryforum/forums/peterbilt-forum.364/
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