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Wiring Batteries and Starter

H

hardonequipment

New User
For Belarus 520
No computers or sensors to get past

Looking for info on how to build a simple
circuit for starting the tractor. Uses two
twelve volt batteries (I think in parallel?
Still learning). None of original wiring is
left.. we will figure out lights and other
electronics later, for now just looking to
wire something up to start that is simple
and safe.

The current wiring set up was a DIY by
another guy but not well put together and
for what it is I think I'd rather rebuild my
own so I understand it all as well. We do
not use a key, toggle switch to turn on.

If someone wanted to sketch a wiring diagram
out on a scrap of paper or point me to other
places I may find this info that would also
be extremely helpful. Just to know what
should be wired to what.

Other tips also welcome
 
Just wanted to add, not sure how to edit post.

We currently bypass the ground switch that a lot of Belarus had on the dash. Open to suggestions on whether or not we should wire that back in. I wasn't planning on it but would if someone gave me a good reason to.
 
I'm looking at pictures of Belarus 520 starters online and it looks pretty conventional.

It has a large terminal for the heavy cable from the battery. It has a small terminal to activate the solenoid.

Activating the starter should be pretty simple. Once the main battery cables are hooked up, you simply need to provide power from the big terminal to the small terminal on the solenoid and the tractor will crank.

You could use a screwdriver to short across.
You could get a remote starter switch, clip one end on the big terminal and the other on the small terminal, and hit the button.
You could run a pair of wires up to the dash to a pushbutton switch, connect one to the big terminal and one to the small, and start it from the seat.
 
I know enough about Belarus tractors to know I dont want to be bothered by one.
That said I do know that at least a some models have a weird starting system that uses a series/parallel switch. The switch ties the batteries in series for 24 VDC to start and then back to parallel to charge at 12 VDC. If this is the case for your tractor, the link below should help.
Series parallel swich
 
This means you need to find a tag on the starter and
see if it says 12 or 24 volt. Hopefully the builders did
this type of thing to identify the equipment as most do.
Who knows maybe they just wrote it on there with a
Sharpie.
 
Looks like it could be 12 or 24 volt. Jensales says it can be either, BAJZ3124 for 24v, B3353I for 12v. That may be their part number though. Tried to post the link, it won't let me.

Maybe there is some marking or part number on the starter or solenoid.

How is it wired now? Have you tried it on 12v? How did it sound?

If it's 24v, running it on 12v it will likely not work, be very slow and labored.
 
I am assuming it must be 24v.. the
batteries are out currently (we took them
out to charge but they definitely need
replaced, just old). After researching and
then looking at the wiring again today the
way it is currently wired I believe had
the batteries were wired together and only
one positive/negative go into a small fuse
panel, which also has one relay run off of
it. That runs to a toggle switch/push
start. My entire electrical system is just
batteries, fuse box, one relay, ignition
toggle on/off with push button, and the
volt meter in the dash is connected as
well. Nothing else on the system yet. So I
would assume the starter needs all 24v? I
thought some tractors with two batteries
ran one battery just for the starter, if
that were the case I would assume the hook
up would be different than what I
described? Or I may be way off though,
still learning how electrical circuits
work lol
 
The starter on my tractor appears to be a genuine Belarus part, in Russian lol. I did download a parts manual that shows the different starters it could have been built with and am certain that the starter on it now is a ST212-A. I do have a wiring manual for it as well (although the original wiring on mine is gone),I could figure probably figure it out by looking at either the wiring manual or the current set up once I know more about electrical circuits
 
This reply was extremely helpful as the
push button start is what the previous
owner wired it up to work as now! I
researched a lot about electricity today
and seems like everything you said is
exactly what the guy was thinking as well.
I think it is wired quite simply I just
need to up my knowledge on electrical
circuits. Now that I somewhat understand
how it works I think I could handle fixing
up his wiring and putting in new batteries
(none in it at the moment)
 
Thank you, all of the original wiring is missing out of mine and the current set up doesn't use it but I do have an electrical manual for it so I could likely check if it did originally. Thanks for letting me know!
 
If it's 12v, that simplifies everything!

Since you have a wiring diagram, use it! If you don't understand it, get some coaching from someone that does, it's not that hard once you get the concept.

If you can post even a screen shot we can help you understand.
 
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