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Re: Wiring Diagram for 400 farmall 12v alt conversion

A

Anonymous-0

Well-known Member
I'm burning up starters one after another. I have a 12v battery, a 12v alternator, and rewired the starter for a 12v. I need to know what is causing my problems. If you could send detailed instructions and a diagram on complete rewire for a 12v system front to back. I would appreciate the help.
 
Because you are wiring as 1v on a tractor that was not, we can supply a 6 v wiring diagam (see below). but the starter relay might be the miswired element. If the starter stays running, it is not right. We need more info on what has been done to it. Jim
Source for diagrams..
 
I started in the middle kinda, put on a new regulator, i don't know as it would make a difference , but it was probably a 6v reg. and replaced the starter, burned it up, replaced gen with 12v alt,rebuilt starter, burned it up, had the starter rebuilt for 12v and now it's out again, I have a new 12v bat., alt., and starter all 12v. I have a new reg. that i'm not sure about, but it seems to still work. same 6v coil, and I've replaced porcelin block. There is a group of wires by the reg. that has a screw joining them together, not sure what thats all about. I have a farmall manual that shows a "diagram" and it just shows components and the connections for 6v. since I evidently am electrically handicapped, I would like to know what wire goes where from stem to stern all components needed, those not needed, and the electrical geanies ph # please. thanks Roy
PS if you sent a 6v dia. it didn't come through.
 
The link is to Carter and Gruenwald in their Links tab, there is a connection to Wiring diagrams.
If you have a new or rebuilt starter, it should not burn out. Many YT contributors have had 6v starters in 12v equipped tractors for decades (we have probably 6 of them) that have had no failures.
Starter drive failures are the most frequent, but rare, event.
Starters fail from burnout (not bearing wear or brush wear) from two issues: running after startup. (like holding the key on start for 20 seconds after the engine fires)
OR: from prolonged starting effort on a reluctant tractor engine. The duty cycle of a starter motor is about 20 seconds with 3 to 4 minutes between start attempts. If the engine is difficult to start, it needs to be tuned to start better. If it is a puller, and tweaked to unreliability to win, it still should start easily with 00ga cables and a 1000 CCA 12v battery.
Our tractors usually start after the second piston comes to the top. The starter wear is dramatically reduced because they start instantly.
Tell us about te way yours works. Jim
 
Take the standard wireing diagram, eliminate the wiring for the genny and VR. Build new harness without wiring for charging system. Add in wire/wires needed for the aleternator. Should work just fine. Just make sure everyting is hooked up as it should be.

Basically you should have a hot wire to the ignition switch from the battery terminal on the starter, a wire from the ignition switch to the coil. A hot to the light switch again from the starter terminal. Positive cable from a 12 volt battery to the starter and the - to a good ground on the tractor. One wire alternator goes to the amp guage and from there to the hot terminal on the stater where the batt cable is hooked up. A 3 wire alternator should have another wire to the ingition switch. Lights should be wired the same way as from the factory.






Rick
11712.jpg
 
no prolonged cranking when it works it'll fire right up. i think I will just go end to end with new wireing and see what goes then. How can I be sure about the rebuild job? you mentioned bushings last awhile, if it's a rebuild it ought to all be new right?
 
I looked at the page sent, there's not a "400" listed, when I click on the IH a diagram appears but you cant read it. thanks Roy
 
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