Circuit breaker ac 620

[compostibles 0]

My allis 620 has some interesting wiring from the previous owner, and a couple of years ago the positive cable from the battery got shorted out under the hood, causing some of the wiring to melt under the dash. I have been having problems with the battery getting a charge, couldn't get the ammeter to work, and the starter motor wouldn't consistently fire when I turned the key.(bad switch, and the wire from the ammeter had been cut somewhere in the wiring harness.)

I broke my foot last summer, so I wasn't doing much of anything, so my 16 yr old gear head wannabe pulled the motor from the tractor to see if we could rewire it, but didn't label which wires went where. Not that it mattered much since the routing and condition of the wires were questionable at best.

I have just a couple of questions to start with.

-the circuit breaker between the starter motor and the ammeter. What size fuse?

-I'm a little fuzzy with the wiring that comes off the flywheel, which wire does what.

-the 5 pole starter switch I picked up from Napa has the "M" for magneto- where does this connect (the rubber plug for the back of the starter switch had been cut off)

I'll probably have more questions later.

Thanks all!

[720nut 4,225]

My thoughts are that you need to purchase a new harness and start over. Believe B&B in New Jersey has new ones and would sure solve some of your issues. I believe breaker is 20 amp at least that's what my 620/720 have on them. Others will be more helpful.

[ShaunE 1,271]

I second what Lloyd said. You may want to post this on the unofficial allis page to get a quicker response from Steve about the wiring.

[phillobbezoo 139]

Pretty sure the circuit breaker is a 30 amp, I know that's what I have in mine which contradicts what Lloyd said so I dunno. I do how ever agree your best bet is just starting with a new harness

[720nut 4,225]

Phil may be wrong but thought I replaced old one with a 20, haven't had any issues

[midnightpumpkin 83]

quote:

-the 5 pole starter switch I picked up from Napa has the "M" for magneto- where does this connect (the rubber plug for the back of the starter switch had been cut off)

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You will need a 5 pole ignition switch for a battery ignition, the fact that yours is marked with an M says it is for a magneto ignition.

Stens 430-249 or 430-512 depending on the hole size in your dash.

The connector plug with pigtail wires is Stens 430-223.

John U

[isetta 50]

Briggs part: Circuit Breaker 1665238SM is shown as a replacement for Simplicity 172163 and is labeled as 20 amp

[720nut 4,225]

Thanks Rick thought I had read that somewhere