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Massey Harris & Massey Ferguson Tractors Discussion Forum
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165 alternator

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G Cole

03-07-2004 07:33:52




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Put a new alternator on a 165 and new battery. Its not charging. I have 12.5 volts going to the alternator but only about 6 volts coming back. I have tried running the rpm's up and its no different. What do you think




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g cole

03-09-2004 09:07:03




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 Re: 165 alternator in reply to G Cole, 03-07-2004 07:33:52  
the wiring has been changed quite a bit on my 165. can someone mail me the simplest way to hook up an alternator. The alternator I have has 3 terminals. One big one for the battery and 2 other small terminals marked 1 and 2. Thanks



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jake

03-08-2004 14:03:24




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 Re: 165 alternator in reply to G Cole, 03-07-2004 07:33:52  
how did you measure that you have 6 volts coming back? if it wasn't connected to the battery when running, you may have ruined your regulator. Is your wiring ok? The battery should be directly connected to the big post(there may read b or bat), and a wire running to the "charging light" post from the ignition switch or from the oil pressure switch, depending of the engine type, so that it only gets juice when the engine is running, or ignition is on.
How high did you rev it? I installed an alternator to my mf 168 and it needs almost 1600 rpms to get charging.

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G Cole

03-08-2004 19:44:52




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 Re: Re: 165 alternator in reply to jake, 03-08-2004 14:03:24  
I used a wiring diagram used my a massey mech. The hot wire actually comes off the starter to the big terminal on the alternator. It has a jumper from there to terminal 2 and then terminal 1 has a wire going back to the oil pressure switch. I measured 6 volts off terminal 1 to grd.



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jake

03-10-2004 10:20:43




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 Re: Re: Re: 165 alternator in reply to G Cole, 03-08-2004 19:44:52  
Hi!

You measure the charging voltage directly between ground and the big post, if it shows 13.5 or more you have a charging alternator. Under 13 or no change from the voltage that was there before starting, and you are not charging.

I think you should test the alternator by disconnecting the wire from the terminal 1 and running a jumper wire directly from the big post to the terminal 1. If it starts to charge after this mod, then you have a bad oil pressure switch. This method is only good for testing, because if you leave it that way it will discharge the battery.

Btw, oil pressure switch on my mf 168 went bad a few years ago, and i replaced it with a simple toggleswitch, you could try this is if you suspect a bad oil pressure switch.

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g Cole

03-10-2004 10:31:54




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 Re: Re: Re: Re: 165 alternator in reply to jake, 03-10-2004 10:20:43  
If I ran a big wire from the battery to the big post on the alternator and then there is a jumper wire from the big post on the alternator to terminal 2. Terminal 1 goes to 1 side of an oil pressure switch of which I don't know if the oil switch works or not. Where could I run the wire from terminal 1 and connect it to be sure of charging. Thanks



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jake

03-10-2004 13:25:44




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 Re: Re: Re: Re: Re: 165 alternator in reply to g Cole, 03-10-2004 10:31:54  
you could put an on/off toggle switch to the dash, and run a wire from the n. 1 terminal on the altrenator to the switch and run a wire from the other post of the switch to the positive battery post. The idea of this thing is to only provide juice to the number 1 post when the engine is running. When you start the engine, turn the switch on and after you shut it down, turn the switch also off. This is how it now works on my tractor.

If you decide to leave it this way, put a 10 amp fuse to the line to prevent any accidents.

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Marcel Gosselin

03-08-2004 11:00:51




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 Re: 165 alternator in reply to G Cole, 03-07-2004 07:33:52  
I am not an expert, but if you have a factory alternator I would guess it is the voltage regulator.



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