Allis G sparking when battery unhooked

You get a spark when connecting the ground cable to the battery? With no light turned on? We need more concise explanation or the situation.

Allis B, IB, Low B, G, D10, JD M, 8KCAB, C152

I know there is a short somewhere but I don't know what from. There is only a toggle for on/off but it sparks both ways. When cables are hooked up I get nothing when I pull the starter Rod. It acts like there isn't a battery hooked you

Your cut out relay on the generator probably has stuck points. Disconnect it and then see if sparks go away. Wink

CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914

You need a more descriptive current indicator than the spark at connection. I'd suggest a 6 volt 1 amp lamp like a car dome lamp. Wire that lamp between the battery post and the battery post connector. It won't be destroyed by a short and will indicate by lighting, brighter the greater the potential short circuit current. Then take the circuit apart one circuit at a time until the lamp goes dark. Then reconnect that circuit and disassemble it until you find the cause of the load or short.

There isn't anything in electrical circuits that fail more often than not to reliably predict such problems. The diagnosis needs application of a logical procedure that I just described to be successful without simply replacing all electrical parts and wiring.

Gerald J.

Since I had the problem of "no juice" from battery to starter, I decided the starter was grounded out and removed it for repair.

I checked the continuity from the (-) starter battery cable and the frame of tractor. My meter beeped saying it was a complete ground. I made sure the battery cable wasn't touching the frame.

Gerald J. wrote:

The beeper test is probably based on continuity for one or two milliamps. The starter requires a connection that can deliver at least a couple hundred amps, 100,000 times greater current so the continuity tester isn't a good indicator for the starter. That's partly why I suggested using a 1 amp lamp, it self protects itself from a short and doesn't show the current from a wet sprig of grass.

Have you ever cleaned the battery posts and connectors? My lifetime experience is that they need cleaning twice a year on a 6 volt system because there isn't much tolerance for dirty connections at 6 volts. My dad assigned that task to me about 1956 on his first new car, and 1954 Ford I block 6. I used a sturdy pocket knife blade to remove the corroded metal of the post and the connector until they shined. Today I use a wire brush that seems to be good enough at least for 12 volt connections that need to be cleaned every couple years.

Gerald J.

It's got a new 6 volt battery, and a new (+) ground cable. The (-) cable to the starter has bright shiny copper strands (00 gauge) but the rubber is deteriated. I swapped it out with another cable and got the same results.

Edited by rtr - 08 Nov 2016 at 10:06am

I'd look first at the generator/cutout. Disconnect those wires first and see if it still sparks. If so, keep it disconnected and look for a short in the wiring.

If the cutout relay is stuck, then the generator will spin with the battery connected, and the fan belt off.

Gerald J.

It can't spin and turn the engine over, too much load.

CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914

Ok.....figured out the problems (kind of).

Bench tested starter and it worked, so I decided to test the "New looking" 6 volt battery on the tractor even though I had charged it and was getting spark with it. It tested at 2.4 volts. DEAD. Reinstalled starter and I went and got a 12 volt truck battery and went to hook it up on the tractor keeping the positive ground system. Got a large spark this time so I decided to unhook the wire on the generator closest to outside (on the very top). When I unhooked that wire the sparking at the battery stopped. Sorry for not knowing which wire I unhooked, as it was dark outside and I couldn't make much of anything.

Anyways....put some gas in her, turned on the fuel valve, sanded the points a little, and she fired to life!! Ran good with no smoke for a couple minutes then died. Carburetor was dripping gas, and I tried to restart with some ether to no avail. I got a couple of pops and then it wouldn't do anything after that. I presume that the plugs got wet since the points were still firing. Looks like she'll need a tune-up and carburetor rebuild at the least.

What could be the problem with the electrical system? The Voltage Regulator?

Ok....it is a cut out relay. They both visually look the same. My bad.

I will have to see. probably going to have to remove the hood to do the repairs now.

Joe I clearly see the difference there but the farmalls use one that looks like a VR. Pretty sure mine looks original except someone added a VR. I can get pictures soon

Can someone provide me with the correct part number for the Voltage Cutout. I also need the length of the original battery cable to the starter (- cable). I'm gonna go to my local starter generator repair shop and get those parts. He has 2/0 cable and he will make the battery cable there.

I'm going to try and keep this one original

Does anyone know the length of cable I need? I am supposed to pick my other Farmall parts up this week from his shop and would like to get the battery cable made. Details are in my original post.

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