KSTech Posted May 18, 2018 Share Posted May 18, 2018 (edited) Hello, I am just finishing a post "ground out fire" on a tractor just sent to me from another hub (No History). The Primary power cable(Starter) is suspect to have rubbed against the bell housing. I have custom built all main cables and replaced cindered sections of main harness(minimal). Problem is I have zero power anywhere except for the direct ends of the cables I just installed. There is power to the firewall stud, starter, etc., but it seems that there is a breaker or electrical solenoid I am missing? Notable detail > although there is power at the firewall stud there is no power to the ign. switch, nor the upper fuse block? There are no signs of power anywhere to the tractor, no int. lights, no key response(incl. solenoid/ relay click), nothing. I have verified power is at both sides of the kill switch. I have checked all upper block fuses and kick panel fuses and scoured for inline fuses. I do have a fuse diag. for my 2015 Macks and I have verified that quite shockingly all of the fuses are intact??. Can anyone tell me the location of the "little black box" electrical breakers/ solenoids TIA! Edited May 18, 2018 by KSTech Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 18, 2018 Share Posted May 18, 2018 There are 2 fuse boxes , one on top of the dash and the other by clutch pedal inside on the fire wall. Quote Link to comment Share on other sites More sharing options...
KSTech Posted May 18, 2018 Author Share Posted May 18, 2018 21 minutes ago, Mackpro said: There are 2 fuse boxes , one on top of the dash and the other by clutch pedal inside on the fire wall. Hi, yes I appreciate the info, I am familiar with them. This truck is 3 years older than most of my fleet and I am new to it. It has a kill switch at the battery box just was not sure if there was another safety measure. Some trucks have a 135A or 165A breaker near the rear axle. Anyways after an entire day going at this I have determined that somewhere in the system there is another short. I found that the frame rail ground was 12.4V, after some eliminating I learned that the pair of cables that go from the battery to the 2 firewall points were the cause. Then after pulling the pass thru determined that it is inside the cab and tested it to the point where it meets the upper FB. It checked out to that point... So I pulled the fuse box... Now I all that is left is to locate which socket is harboring the culprit harness and the corresponding part that has the short. It is very odd that the voltage would be so clean and directly related to connecting to either one or the other of these FB's. I hope this knowledge can help someone recognize this fault. If not I will post the follow up. This truck came to me a neglected bag of cats with a completely clear DVIR book... On it's 4th run from our terminal it caught fire, this after it had already had more than $4k worth of repairs and parts replaced... Factory shocks 829kmls... Grrrr lol Quote Link to comment Share on other sites More sharing options...
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