Power for that pin comes from fuse #1 in the IPM. It leaves the IPM as a
red/orange wire. It's spliced under the dash, to provide the power lead for
the brake controller connector, and then runs to a 14-pin connector down by
the firewall bulkhead connector. From the other side of that connector,
it's a white/red wire that runs to the trailer tow connector (the ten-pin
connector that the 7-way trailer plug connects to).
If you're positive the fuse is good, check for power at pin #1 of the
trailer brake controller connector. If you have voltage there, you've got a
break in the wiring between the firewall connector and the back of the
truck. If you have no voltage at the brake controller connector, you've got
a wiring problem back up to the IPM (fuse box)
Thanks for the info. I was surprised to see that fusible links are
still in use. I wasn't looking forward to soldering wires. I'm glad
it's not going to be a bad fusible link.
I'll try your sugestion tonight.
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