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post #1 of (permalink) Old 01-21-2001, 12:43 PM Thread Starter
 
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Electrical Guru\'s Please read.

Plowing snow today and every time I shut off my 65 CJ5 stock 4 cyl.the generator acts like a motor and spins the hydraulic pump.The fan belt is loose enough to allow this.The pump has its own belt from the generator.The only way I can stop this is disconnect the battery.What causes this?Thanks for any help.
Frank

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post #2 of (permalink) Old 01-21-2001, 12:54 PM
 
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Re: Electrical Guru\'s Please read.


this sounds like there is a fault in a ground on the generator, or something close by. It should shut off when everything else does since their all on a common ground.
Check and clean the grounding point.


'74 CJ5/5.9L Holley 4bbl/3spd/31"/not running
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post #3 of (permalink) Old 01-21-2001, 01:16 PM Thread Starter
 
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Re: Electrical Guru\'s Please read.

What would the grounding point be?I'm not to good with electrics.

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post #4 of (permalink) Old 01-21-2001, 02:41 PM
 
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Re: Electrical Guru\'s Please read.

the ground would be a black line coming out of the generator. try and find out however the generator gets it power, and trace the lines back, and the ground should connect to the frame somewhere.

'74 CJ5/5.9L Holley 4bbl/3spd/31"/not running
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post #5 of (permalink) Old 01-21-2001, 03:11 PM
 
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Re: Electrical Guru\'s Please read.

The old generators are essentially series wound DC motors. If you spin one and ground the field (the little terminal) it will generate a DC voltage. As you increase the voltage to the field, the generator output will decrease

By the same token, if you apply 12 Volts to the armature (the big terminal) with some voltage applied to the field you end up with a big ugly electric motor. You can control the motor speed by varying the voltage on the field.

Now if you look at your wiring you will notice that the big wire from the generator connects to the regulator instead of the battery. One of the functions of the regulator is to shut off the electricity to the generator so it doesn't motor.

So, based on the problem you describe, I would say that your regulator went T.U.

You can probably fix the problem by:

1. Replace the regulator if they're still available
2. Pop the cover on the regulator, clean the points and make sure there are no burned or melted wires inside. You may get lucky.
3. Put a switch in the generator output wire.
4. Tighten the V-belt. It may put enough load on the generator to stop it.
5. Junk the generator and get an alternator setup from a 68 or later.

By the way, a generator is usually grounded through the mounting brackets. If it motors, it's probably got a good ground.


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post #6 of (permalink) Old 01-21-2001, 04:55 PM Thread Starter
 
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Re: Electrical Guru\'s Please read.

Bob,Thanks for the informative post.Yesterday I did some P.M.on it and I noticed that the belt was loose there was no adjustment left after I losend the bracket so I just tightend everything back up.When I started plowing today thats when it all started.Its dark now so I will have to check it out tomorrow.
Frank.

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post #7 of (permalink) Old 01-21-2001, 05:40 PM
 
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Re: Electrical Guru\'s Please read.

I forgot to mention that if you only tighten the belt to load the generator you'll still have current flow through the windings. That could get uuugly ... fried wires and maybe worse.

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post #8 of (permalink) Old 01-21-2001, 11:05 PM Thread Starter
 
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Re: Electrical Guru\'s Please read.

No worrys about frying anything,I have a battery disconnect and I can't get the belt any tighter.
F.T.D

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post #9 of (permalink) Old 01-22-2001, 06:26 PM
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post #10 of (permalink) Old 01-22-2001, 07:39 PM
 
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Re: Electrical Guru\'s Please read.

Shootist,

Circle D, all of the above.

Hell, I'm so old I remember watching television by candlelight !!!

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