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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Alternator problems - MF 40

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Greg Reed

01-29-2006 11:55:18




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I've got a problem with the alternator / charging circuit on my MF 40 Ind. With the engine running, there's about 18V at the battery, and the ammeter is showing a positive charge of 30+ Amps. After a few minutes, the alternator gets very hot to touch.

The Delco Remy 12V alternator looks original, but the external voltage regulator is only a year old.

Any tips for how to diagnose which component is at fault?

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Greg_KY

01-29-2006 12:26:11




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 Re: Alternator problems - MF 40 in reply to Greg Reed, 01-29-2006 11:55:18  
Voltage regulator.



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Bob

01-29-2006 13:59:31




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 Re: Alternator problems - MF 40 in reply to Greg_KY, 01-29-2006 12:26:11  
To add to that, the voltage regulator must be well grounded. If it is mounted with rubber grommets for vibration resistance, there will be a ground braid to connect the ground past the grommets. If this is broken, or missing, this system can overcharge.

I don't know how the circuit is hooked up, in some cases a broken voltage sense wire to the regulator will cause overcharging.

Likely, it IS a bad regulator, I just suggest you check the items above before laying out $$$ for a new regulator.

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