Re: Had to disconnect neg bat cable to stop starte

Posted by txblu on August 29, 2004 at 07:11:39 from (209.151.113.145):

In Reply to: Re: Had to disconnect neg bat cable to stop starte posted by rustyfarmall on August 29, 2004 at 05:54:19:

I agree. Don"t replace the starter till necessary, and then it might just need an armature cleanup and some new brushes.

Melting the ammeter wires confuses me. The high current starting current is not supposed to be going thru it. The current NORMALLY required to energize the tractor ignition and starting ckt is less than 10 amperes. Wiring usually consists of 14 AWG at least (especially if it were 6 volts before) which is rated for 15 amperes constantly.

If you are still using your 6 volt starter, which most do, and converted to 12 volts, you are doubling the current to your starter thru the high current contacts of the starting solenoid. This could cause them to weld shut and cause the starter to lock up as you describe.

If you still have the 6 volt solenoid, you are putting twice the current thru the start switch and solenoid control winding, which may account for the melted wiring.

As mentioned, replace the wiring, the start switch, and get a new 12v solenoid being careful to get the right one. Then see what happens before you dig into the starter.

When I say the right one, I mean this. Your solenoid control wiring has to be suitable for your tractor"s hookup.

1. No transmission safety switch. The start switch supplies 12v to the start solenoid (via ignition switch being ON). Internally, the 3 TERMINAL solenoid has the low side of the control winding grounded (no 4th termanal).

2. Transmission safety switch. The Ign key is turned on supplying 12 volts to a 4 terminal solenoid (2 control winding, 2 high current). The 4th terminal goes to a switch on/near the transmission that connects this wire to ground when you push the button (if the transmission is in neutral) thus energizing the solenoid.

Chew on that for awhile and come back for more if needed.

Good luck

Mark

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