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Massey Harris & Massey Ferguson Tractors Discussion Forum

Alternator goes berzerk

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CityBoy

10-20-2003 20:03:12

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Was making good progress turning the neglected MF35 into a serviceable tractor -- new battery, new gauges, new radiator cap, new antifreeze, new oil and filter, new alternator (10 SI) -- and then a small problem. Warmed up tractor prior to changing oil. When I turned it off it kept running and voltage level shot up past the gauge. Killed it with the choke. Had alternator tested; it's now dead (low voltage). I had run it before with this alternator and it was fine.

I had messed with the wires to the alternator and may have accidentally switched the sense and field lines. Or put another way I may have jumpered the output post to the field connection (#1) rather than the sense connection (#2). Would this have fried the alternator? And if so then why fry only when I turned ignition off?

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Allan C

10-21-2003 21:27:48

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Re: Alternator goes berzerk in reply to CityBoy, 10-20-2003 20:03:12

If you reversed the connections you may have fried the internal regulator. They're cheap and easy to change. Make sure you watch which holes the insulated screws go in.

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