G-900 Electrical issue

F-MM · Jul 11, 2015

I've got a G-900 Diesel that I've had for years. Doesn't get much use but we put it on a rock picker this spring with my son running it. Anyway, something happened and it died and wouldn't start so we pulled it back to the yard. After sitting a couple months I put in a new battery and turned it over, nothing, so opened a couple lines up and the pump bled out and she started. Only now, I left the new battery connected and it was drained the next day. Now the regulator seems to be taking current with the key in the off position, not in the on position?? Also it shows charging about 10 amps with the key off, O with key on?? Also the temp gauge will try to top out in the off position, read normal in the on. Anyway now I have to unhook the battery every time or leave the key on to hold a charge after running it. Any ideas, yes, the battery is hooked up negative ground like it always has been. Does this sound like a bad regulator or what could do this all of a sudden?
Thanks in advance.

Alan K · Jul 11, 2015

Possibly might be something grounded somewhere. As for the regulator, most of the time you can tell on the gauge if the contact points in them separate as the needle will go back to zero when you shut the tractor off. Since yours is doing weird things not sure what to tell you there. Where are you located?

Polardiesel · Jul 12, 2015

Try unplugging the reg. First, then try it, if not that, like Alan said could be a short in the harness. I've had bad ignition switch do weird things too

Alan K · Jul 12, 2015

I second an ignition switch doing funny things. Worth checking as well. When I was working in town at a shop they had a 4020 gas that wasn't running right. The owner had taken it to the Case/IH shop and they replaced several parts but it didn't help. The owner then brought it over to the repair shop I worked at. The boss went through all of the normal parts again: points, condenser, cap, plugs, wires, and checked the timing and the distributor out. I told him check the ignition switch. He kind of looked at me funny as "yeah right". They replaced the switch and that was the problem. I knew it might be a possibility because our Oliver 770 had a bad switch. It would run fine at times and then sometimes it would pop real loud like a gun going off. Funny things happen.

Polardiesel · Jul 12, 2015

And if the tractor gets rained on much the switch won't last long either. Only thing that puzzles me with this is the amp Guage reading positive, unless it's back feeding through the switch some how, or a mouse went to work under the dash. I would think if it were a ground issue,since the temp gauge is doing that, the oil pressure should also, since they're both electric. The current has to be reverse flow through the amp gauge for that to happen????

F-MM · Jul 12, 2015

Thanks for the comments, I am in SE North Dakota. No MM dealers left around here anymore so we are on our own. As for the regulator, when I realized the new battery had been drained overnight, when I replaced it after charging it up, as soon as I connected the last connection I could hear the regulator click like it does normally when you turn on the key. I thought I had maybe left it on but it was off. Then I turned it to the on position and that stopped the current draw, no click and no small spark while connecting the ground. It's like the switch is backwards. I'm not sure why it also moves the temp gauge as I stated earlier. It does show the amps charging with the key off but nothing with it on. I guess I better get behind the dash and check things out. We did get about 10 inches of rain since it quit early in the spring and it was sitting outside so maybe something got wet and shorted. It has really nice original wiring on it yet, nothing has been rigged or anything.
Thanks again.

Alan K · Jul 12, 2015

I wondered that as well why only the temp gauge is doing it and not the rest. Maybe that is the wire that is having a "problem" so to speak for starters.

Polardiesel · Jul 13, 2015

One thing to keep in mind.....if you charge a completely dead battery, and get the charger on backwards, it will charge the battery up backwards, and you'll have a reversed polarity battery! Just a thought on the amp gauge reading positive when any load on it should put it in the negative.

F-MM · Jul 13, 2015

No kidding, I had never heard that before. No, I actually switched the battery out when it was dead and grabbed a good one out of one of the combines that was fully charged. It still did the same thing as before the first one went dead. Thanks for the info though.

G-900 Electrical issue

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