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Just tried to wire up my alternator on my 1978 belarus mtz50.<br>
3 wires to the outside of it where ate off by cows! connected the heaviest wire to the biggest terminal which has 12v through it when the grounding switch is on. The smallest wire is an earth wire which also comes from a black box mounted to the power steering at the front(relay i think) which i put to the top terminal. The next wire has 12v running through it when grounding switch is on and then drops to about 2v when connented to the bottom terminal of the alternator. When tractor is running, power remains the same at these points but power is then output out of the 2 small wires toward the engine side of the alternator then toward the regulator in font of the windscreen. This alternates from 3.4 to 6 or so volts each. The charging light goes out but the battery is not charging. Looked online and saw something about a jumper wire, so tried a jumper wire from the constant 12v to the switching wire on bottom terminal. Worked well, everything charging as it should, ampmeter in dash going up full no promblem, went round to check the wiring at alternator and it had got very, very hot!! Turned all off and am now back to scratching my head! Sorry for going on and on but any help would be very greatful or maybe a wiring diagram would help. Thanks all.

Belarus MTZ50 Tractor How Tot Wire Alternator
Belarus
Replies 2 Post by stevie

I just bought a tractor that has been lying in a field for ten years. I have no way of knowing what model it is. I think it is an mtz 50 (maybe a super?) its 1978 (date on cab plate) with a D60 engine. Is there any way of telling what model it is, chassis no.etc ?<br>
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Also, the grounding switch on the floor for starting the tractor was seized. There is a locking button on the top of it to keep it on. Does this be left on all the time after the tractor has started?<br>
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Also, cows ate the wires off the alternator. There were three wires towards the outside of the tractor, white, black and orange. These run to a big relay at the front of the tractor mounted on the power steering unit then back to the dash. I need to know which terminals these wires go to on the alternator. There are also two finer red/pink wires attached to the engine side of the alternator which run up along the top side of the engine to a small black box just outside the front of the cab under the bonnet.<br>
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The previous owner told me that this tractor is 24 volts, it starts and runs really well, it is just not charging.<br>
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Will this tractor charge the two batteries whenever the ground switch is disconnected or does it be left on all the time?<br>
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Any help would be greatly appreciated!

Belarus Tractor Alternator Wiring and Model Help MTZ50
Belarus
Replies 8 Post by stevie