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no, just did some checking tonight, I am getting power out of the switch, but have not checked at the lock. will test that first. It worked when I first test drove the truck. now it doesnt. I want to make sure the wiring is ok.

the one on the 543 is in front of a cross member and over top of the E brake drum. I cant fit my hand in there. I think it would be eaiser to add one than replace that one. note: it only locks the rear

no. Its a electric over hydraulic line lock on a M543A2

anyone ever replace this? I am thinking of adding a new one right after the air pack and before the T on the frame rail.