2004 T190 blowing 100 amp fuse on start up

[baas]

My bobcat keeps blowing the 100 amp fuse above the battery. I took it to our local dealer and they couldn't find anything wrong. I put new fuse in and took it home. It started and worked fine that day. A couple days later I tried to start it and it did the same thing. It was working fine with no problems until it started blowing the fuse a couple weeks ago. I have keyless control pad and it starts to come up and then dead, even before I enter my codes to start. Anybody ever have this problem? Assuming its a short somewhere but why all of a sudden and how do you locate if dealer can't find it?

 

[Bobcatdan]

I'd say there is a dead short between the 100 amp and the main fuse box. Giving the dealer the benefit of a doubt, machines have a way of not acting up for a dealer tech. Been down that road many times. I'd look for a rub behind the the hydraulic tank. If all eles fails, put a mainframe harness.

 

[baas]

I'd say there is a dead short between the 100 amp and the main fuse box. Giving the dealer the benefit of a doubt, machines have a way of not acting up for a dealer tech. Been down that road many times. I'd look for a rub behind the the hydraulic tank. If all eles fails, put a mainframe harness.

Thanks for the advise. I will check that out and see if I can find anything. It would almost have to be between the battery and fuse box, otherwise you think it would just blow one of the smaller fuses in the main fuse box, correct?

 

[Bobcatdan]

Thanks for the advise. I will check that out and see if I can find anything. It would almost have to be between the battery and fuse box, otherwise you think it would just blow one of the smaller fuses in the main fuse box, correct?

I can't think off any part that could blow the 100 amp because everything is protected by a normal size fuse, even the alternator. The starter has a separate lead to it so I can't see that blowing the fuse either.

 

[baas]

I can't think off any part that could blow the 100 amp because everything is protected by a normal size fuse, even the alternator. The starter has a separate lead to it so I can't see that blowing the fuse either.

If the battery was loose and a terminal touched something metal, would that cause it to short out? I know the positive side has a shield on it but maybe it is touching something.

 

[Bobcatdan]

If the battery was loose and a terminal touched something metal, would that cause it to short out? I know the positive side has a shield on it but maybe it is touching something.

I don't think so because it should ground back threw the machine and not threw the 100 amp. Either way, get the battery secured.

 

[biggie]

I don't think so because it should ground back threw the machine and not threw the 100 amp. Either way, get the battery secured.

The only thing I can think of blowing the Mega fuse, is the glow plugs

 

[7LBSSMALLIE]

glow plug relay is stuck on. change out with headlight to confirm.

 

[biggie]

Have u figured it out? What was it?

 

[7LBSSMALLIE]

Have u figured it out? What was it?

glow plug relay is stuck on. seen it been there etc. couple quick checks. swap out .relay. give back o box a good look. that's the fuse box. can be pried outta cover for inspection. nasty green more prevalent in open rops. clean salvage etc.

 

[bobsracing]

I have a t190 same issue. Removed the glow plug relay now it runs. Replaced the relay. Still blows the fuse. Maybe a bad glow plug?

 

[foton]

I guess the thing to do is to disconnect all the glow plugs and test again to see if the fuse pops. If the fuse does not blow it might be kinda tuff to tell which glow plug is bad with a VOM because you are looking at such low ohm readings to start with, if you got a portable amp gauge ,go to the battery with the hot to the gauge and take the out of the gauge to one glow plug at a time and compare load readings ,the one that pulls the most amprees is the bad one I would think. be carefull as the bad one is gonna spark a bunch. good luck.

 

[foton]

one thing I forgot to write is most VOMs have a 10 amp scale ,on a good glow plug that I think would be ok, but since you have something blowing a 100 amp fuse if you were to test the bad one it would burn out that scale on the meter,so use a heavy amp gauge 30 amps or larger and do not hold it on long if it pulls a big spark or a battery load tester (best choice). I think a good glow plug should pull around 5 amps ,I think it has been awhile since I tested one.