hello I have 05 komatsu d41p-6 dozer it started and shut off now I have no power to key nothing

Need jelp dont know what happened no.power b atterys are all good fully charged

figure it out yet?

Circuit breaker ,fuse ,lose- broken wire this is where I would start.

Going to have to do exploratory surgery I suspect. A lot of manufacturers went cheap as GM and Ford did years ago on cars with Fusible Links, will be a soldered in section of a 'soft spot' in the wiring that burns in two on hot shorts. If that is the case find the raw spot where it shorted or the component that is failed to ground and DO NOT install a piece of regular wire until you find the problem, install a fuse holder is a good choice and they are easy to find. Look to you shop manual electrical pages to find the ratings.

still have no power to key completely dead batts are fully charged seems to be a safety relay just cant seem to locate????

machine is and 05 komatsu d41p-6

They usually put the battery relay somewhere close to the batteries. I have not been into one of those so can't tell where to look. A parts diagram might help you.

There should be a fuse or fusible link next to the battery relay when you find it. If it is a fusible link the insulation will be all bubbled up. There may be a fuse on one wire also. The relay should have four terminals, two big ones that the battery leads hook to and two small ones. As I recall battery power goes to one of the small terminals and through a coil in the relay then out the other terminal and to the key switch in the cab. Turning the key to on grounds that circuit which energizes the coil and closes the relay so battery current will flow.

DMiller said:

Going to have to do exploratory surgery I suspect. A lot of manufacturers went cheap as GM and Ford did years ago on cars with Fusible Links, will be a soldered in section of a 'soft spot' in the wiring that burns in two on hot shorts. If that is the case find the raw spot where it shorted or the component that is failed to ground and DO NOT install a piece of regular wire until you find the problem, install a fuse holder is a good choice and they are easy to find. Look to you shop manual electrical pages to find the ratings.

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Well u where right found issue wire going to ignition in main wire harness was broke some how had a bad spot cut back and installed a fuse as u said thankyou took some time but u where spot on

Mind you remember where that 'bad' spot was as most likely a fuse link and cooked out, there may be others relatively close.

DMiller said:

Mind you remember where that 'bad' spot was as most likely a fuse link and cooked out, there may be others relatively close.

Click to expand...

will check out again today but i followed wire all the way back to where it comes out of pinned connector so hopefully it will be all good now .