John Deere 4100 electrical/no start issue

[Rdmmo]

Looking for some advice on my 1999 John Deere 4100 HST. When key is in the on position everything is fine, lights work etc. when I turn they key further to start the engine, it may turn over a few times but the fusible link on the starter blows immediately. Battery connections and grounds to frame are all good. I've looked for bare wires everywhere and can't find anything. Checked seat safety switch, PTO switch etc all good. Any help would be greatly appreciated. Snowing and blowing here and I need to get to work. Thanks!

 

[beenthere]

Maybe begin by removing wires and cables one at a time and tracing the voltages to find out where the problem lays.

 

[/pine]

Sounds like the starter...especially if it is the only thing on the fuseible link

 

[Tx Jim]

Sounds like the starter...especially if it is the only thing on the fuseible link

Ditto. I suggest to attempt to check amp draw on starter while engaging starter.

 

[mike48130]

Internal short on the starter.

 

[Phillip w]

Everyone done picked my diagnosis: internal short in starter.

 

[Rdmmo]

Hmmm. Just not sure it's in the starter because it will turn over and seems to work well before fusible link pops

 

[oldnslo]

When the fuse pops use a volt meter to check resistance to ground. Dead short would read zero

Bad connection could also cause excessive amp draw which would trip the fuse.

 

[mike48130]

Put a clamp on amp meter on the power cable and see what it's drawing. Either you have a starter motor going bad, some kind of short, maybe a bad connection or the engine is binding and causing a heavy load. Could be a binding alternator or water pump.

 

[Rdmmo]

Everyone done picked my diagnosis: internal short in starter.

Starter is good. Removed and had it load tested and everything checked
out fine