12 Volt Power For Cab / Key Ignition Circuit

[dickandlois]

Well, after looking for the issue that was shutting down the Diesel fuel supply I spotted a sick 100A Auto reset relay. Weather and time had taken its toll on this one located close to the starter relay and it supplies all the power to the dash and ignition key circuits.

While I was at it I went over all the connections, relays and relay sockets to make sure they where clean and replaced all the relays, but one at this time, because no one can tell me what it does. Its not on any of the wiring drawings or wire harness drawings I have. The Freightliner help desk listed off all the ones I had found and said they had no clue as to what the other one I found controls. Kind of thinking it is in the ABS system. That module is relatively close to the relay, but the wiring information places it at or near the interment panel. So more time is needed looking at the harness and looking at or for circuit wire numbers to see what circuit goes to the relay. LOL.

Pictures of what a Circuit breaker in not supposed to look like.

 

Failed primary feed ignition Circuit breaker.pdf

 

Rich.