24 volt, but + or - ground?

I got the starter for my forty-five road grader back from the repair shop today, and if all goes well, which it never does, I'll get it put on tomorrow. But, is this going to be positive, ,or negative ground? Anyone know? The generator and the regulator I am assuming are stock, but have been painted over, so I can't read anything off them. Thanks, Darrel

Ask the shop they just repaired it hopefully they know what they fixed... I haven't personal heard of a 24 volt positive ground but that doesn't mean they didn't make them.

Donoman

The Bosch is single wire and I've just wired everything through the original key switch with no drain problems so far. I had to do a bush rebuild on the key switch, so the starter has an additional solenoid in the wiring.  I gutted the switch tumblers as no key came with the machine.  Actually it had a solenoid starter with the wires unsoldered and it was run with a mechanical linkage that used the solenoid as a switch.  Resoldering has worked so far.

The adjuster strap is the original AC 45 one, which is getting to the limit.  A longer angle bracket at the bottom will fix that when I need to.

Many older machines with generator and external regulators were + ground. It does not mater if you wire it + or - ground as long as you polarize the regulator so that the generator will charge correctly. As jaybmiller says starters with field coils will always turn in the correct direction.

Gen to Bat

my 145T with 7000 engine is 24 volt positive ground and should be of same vintage

the started doesn't care on polarity - but the field windings do care in which direction the starter faces to the front of the engine - found that out when I rebuilt the starter on my IH 460 tractor with starter facing back to operator - used a Chev field and starter turned backwards - had to buy new coil for the IH part number . 

Well, I didn't get anything done on it today. Number one; darn important work gets in the way of this fun stuff. And number two; there is a big spacer ring that mounts between the starter and the bell housing, and that accidentally got left at the starter repair shop. It never should have went up there in the first place, but my son didn't know that, and he was the one who dropped the starter off, and I was the one who picked it up. Minor problem. When I get back to it, I am going to go with the positive ground plan. That seems to be the general concensus. Thanks for all of your replies. Darrel

Darrel,

If you are interested in knowing what the polarity was,
one way you might be able to tell is,
if it has an amp-meter and lights, after installing the batteries,
before starting the engine turn on the lights
it should display a discharge.
but if it displays a charge with with the engine off,
then the polarity has changed.
If the amp-meter always reads backwards,
then you need reverse all the wires on the amp-meter,
like take all the wires on a post and move them to the other post.
So all the wires end up on the other post from where they were.
The guys are correct, the starter does not care one way or the other.
But the generator and regular does very much so,
be sure to polarize it before starting the
engine the first time.
It is normal to see an spark or arc when doing so.
Do not leave it connected any longer then 10 seconds as it will over heat the armature.
It is actually the field coils/poles that need to be polarized, not the armature.
Lots of generator regulars are marked with a "N" or a "P" to tell you which
way they are intended to be grounded.
How do I say this, but you need to be careful when polarizing the gen.
or you could fry to regular, if you don't disconnect it while polarizing the gen.
It might be best to ask a local electric shop what the exact procedure to use
to polarizing the generator. Or refer to the service manual.

Good luck and have a nice fall



Edited by AC220fan - 19 Oct 2016 at 11:11pm

honey do's huh? lol

shameless (ne) wrote: honey do's huh? lol

some of that. Some trying to do stuff to pay the bills. Some cattle chores needs doing. Fences need fixing. And trying to keep my tractors happy and my family running. Darrel

Uhhhhh, Shameless. I am kind of stupid, so why don't you come up here and build a couple miles of your super fence for me, and I'll watch you very closely so I learns how to do it. If I don't catch on after a couple miles, just keep on going. I'm sure that I'll eventually learn it. I'll even provide the materials and equipment for you. Darrel

Shameless if you can build a fence to keep the cows in maybe you can go to Texas and build one down there when you get done. I hear there will be a building boom down there soon.