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Re: cant get diag codes for abs gmc 5500
Posted to HD/Fleet Forum on 8/25/2012 1 Reply

If you still cannot get hooked up follow the harness from the drivers side fuse/relay/power box on firewall. It will go down and cross over under the radiator to the other side. We have had 2 that had rubbed/broken wiring that was part of the ABS module power... Login to read more.

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