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4020 12v conversion help

B

buckeyefrmr

New User
I am upgrading a 68 4020 to 12v. Everything seemed to go great, but now I'm stuck at the secondary solenoid. Tractor had the relays on the old starter and I hooked both to the battery post on the solenoid. I have power to the dash, ignition and excite wire at the solenoid, but it won't pass through to the starter. I feel like I'm missing something simple. Maybe I have been looking at it too long. Thanks for the help.
 
When I did mine, I removed the 24 volt starter and everything attached to it and started from scratch. You need to put a Ford style solenoid
between the starter button and the solenoid on the starter. I used a one wire alternator wired to the starter solenoid. I removed the dash
cover and drilled and tapped 2 holes in the casting to install the solenoid, so it was hidden. If you have one local, look at a 4230 or 4430
starter button wiring. Don't over think it. I wired my button direct to the starter and when pushed it made smoke. So, I put the Ford
solenoid on. I used 2, 12 volt batteries, both grounded to the trans case under the floor board, and both positives ran to the starter. I
went to a truck repair shop and got a battery terminal that had a place for a cable in and out and used that for the positive side and that
way I just had one cable to the battery positive post. Hope I am of some help. I have had plenty of help on here.
 
Just a thought, you might have the wire going to the wrong small terminal on the starter solenoid itself. One should be marked R and the other marked S, make sure you are on the "S". Also is the tractor in Park?
 
(quoted from post at 17:55:22 11/05/16) Just a thought, you might have the wire going to the wrong small terminal on the starter solenoid itself. One should be marked R and the other marked S, make sure you are on the "S". Also is the tractor in Park?
Click to expand...

I do have the ignition wired to the S. I is for the coil (I think). Tractor in park, clutch engaged. I wondered about the clutch safety switch, but I have 12v to the S connection when the ignition button is pressed. I am going to check it out anyway. Thank you all!
 
NOT sure exactly what you've got going on, but what you are calling "relays" on the old starter solenoid are simply circuit breakers.

If you'd care to email me, [email protected], I will send you some schematics that MAY be of help to make your conversion work.
 

I'll 2nd what Bob stated that objects you're calling relays at starter are circuit breakers. Do you have both the brown & blue wires on circuit breakers attached to top post on starter solenoid(key 22)? Is auxiliary solenoid getting a good earth(ground) connection?

Photo below is for 24 volts so for 12 volts put brown wire on same top post as blue wire.

42213.jpg
 
looks like I have everything wired correctly from your recommendations. Yes, the brown and blue are on the B side. So the secondary solenoid is grounded through the connection to the tractor (when mounting)? I may need to check that there is a good connection because it's pretty dirty in there. Guess I could also run a ground from the solenoid to a known ground.

From my voltage tests, the voltage won't pass through the solenoid and the ground could be the issue. I did try another solenoid just to make sure I didn't have a bad one. Thanks again! I read through a lot of posts on here before giving this a try and you guys are full of experience.
 
If your secondary solenoid has four terminals, one is a ground and won't work without the fourth terminal being grounded.
 
Just an update... I was not getting a good enough ground with the secondary solenoid on the frame. I cleaned off the paint at the attachment point and fired right up! Thanks for all of the help.
 
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