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Tractor Talk Discussion Forum

Delco 10 DN Alternator draing battery...

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Mark

12-10-2003 13:53:34




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As stated, I have had this alternator rebuilt and my votage regulator is brand new as well. The regulator has 3 terminals, "F", "3", & "4".

The alternator charges great at around 14.5 volts, everythng is great. However, it drains the battery if left for a few hours when not running. I hooked an ammeter to it and it is drawing 2.6 amps. I'm baffled. I have installed a diode (50 V, 1 Amp) on the #4 cire (ignition) and that did nothing. I tried the diode on the regulator's output (#3, bat) and that didn't work. When I disconnect the battery wire from the #3 terminal on the regulator the -2.6 amp goes to zero and my battery stays charged.

The only solution I can come up with is to install a switch to cut the circuit everytime i am done with the tractor, but that's a pain in the A$$ and if i forget I will have a dead battery.

BTW, the tractor is a MF 180, and the ignition source is the oil pressure switch (no other ignition source available)

Thanks, Mark

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ted

12-10-2003 18:35:41




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
If all else fails you can swap your switch for one with an off-on-start. Your mf dealer should be able to set you up with one. Off a an 165?? or maybe off an gray cab combine. I did away with that oil pressure switch when I changed the alt over to a int.reg. on an 1150 It is also handy because you can hook your radio and other accessorys up to the on position.



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Mark

12-10-2003 19:13:53




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 Re: Re: Delco 10 DN Alternator draing battery... in reply to ted, 12-10-2003 18:35:41  
My generator went out on my MF180 and I wanted an alternator. I've had this alternator off my 175 rebuilt and sitting here for a while so I put it to use. My 175 has a 1 wire setup.

Mark



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geneb.

12-10-2003 18:18:57




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
just because you got a new alternater doesn't mean it's any good! also your alt. has a diode trio, if one of these is bad your bat will drain and everything else will look good. also diode is a one way ck valve for electricity.



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jimbo

12-11-2003 11:26:00




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 Re: Re: Delco 10 DN Alternator draing battery... in reply to geneb., 12-10-2003 18:18:57  
Had the same problem.switch alternators.I had one checked 3 times and they told me it was good and finally asked them to exchange it and they did and it solved my problem. The single wire is the better of the alternators.You have to have a short somewhere .



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Jerry L /az

12-10-2003 17:19:01




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
a diode is a electric switch, If check you'r diodes turn them around from the you have them now we had the same problem with our cranes three wire plug in the back of the alt. but I'll be darned if I can remember which wire I think it was the one going to the batt. or ign hope this helps ..... .Jer



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Bus Driver

12-10-2003 15:53:07




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
Have not looked at the diagrams referenced. But one cause of discharge through an alternator is a shorted diode(s) in the alternator. They change the generated AC current to DC. One of the primary causes of shorted internal diodes is removing a battery cable while the engine is running- but they occasionally fail spontanteously. If other diagnoses fail to find the problem, consider this one.



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Big Dean

12-10-2003 15:17:40




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
Take a look at the diagram this link is to & see if it will help



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Mark

12-10-2003 15:33:02




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 Re: Re: Delco 10 DN Alternator draing battery... in reply to Big Dean, 12-10-2003 15:17:40  
Dean, great schematic! My problem is this: the alternator shop gave me a new reg with the rebuilt alternator and it doesn't have a #2 terminal. I have #1 to F on alt., #3 to battery side of the ammeter, and #4 to the switched side of the oil pressure switch. Its a Delco regulator...I'm stumped on this one, I can't find where this voltage drain is occuring.

Mark



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Big Dean

12-10-2003 18:30:45




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 Re: Re: Re: Delco 10 DN Alternator draing battery. in reply to Mark, 12-10-2003 15:33:02  
Mark it sounds like they gave you a regulator for a late 60s or early 70s GM car or truck They do not have the fuel gauge terminal on them but the other wires are the same just hook the fuel gauge wire to the oil pressure switch with the wire that going to the regulator. I have not hooked one of those up for years but the best I remember the first wire goes to the Alternator F terminal the wire from oil pressure switch goes to the second terminal on the regulator & the third wire goes to the ammeter. one other thing to check is the Oil pressure switch to be sure it is turning off when the engine is shut off if not it will keep the alternator excited all the time. Hope this will help

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Mark

12-10-2003 19:08:46




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 Re: Re: Re: Re: Delco 10 DN Alternator draing batt in reply to Big Dean, 12-10-2003 18:30:45  
Hi Dean. I already connected the fuel gauge to the oil pressure switch, it works fine that way. My oil pressure switch is new as well and tests fine (closes when engine starts). I am a little confused about what you mean with the wiring (remember that my reg is missing a #2 terminal.

As of right now I have "f" on the alternator to "f" on the reg...#2 is a blank...#3 is bat and # 4 is ignition. So you're saying I have #3 & #4 backwards? Hmm I will try reversing them tomorrow, that won't fry my reg will it??? I just assumed the guy at the alternator shop knew what he was talking abou but maybe not. Thanks

Mark

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old

12-10-2003 14:02:27




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 Re: Delco 10 DN Alternator draing battery... in reply to Mark, 12-10-2003 13:53:34  
Hook the#3 wire in to the battery/switch side of the coil if its a gasser, if its diesel to the hot side of the switch that should fix the problem



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Mark

12-10-2003 14:05:24




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 Re: Re: Delco 10 DN Alternator draing battery... in reply to old, 12-10-2003 14:02:27  
Old, thanks for responding....As of now, I have the #3 (bat) connected to the battery side of the ammeter, wouldn't that be the same as if I connected it to the hot side of the switch? They both are directly connected to the bettery.

Mark



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old

12-10-2003 18:23:28




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 Re: Re: Re: Delco 10 DN Alternator draing battery. in reply to Mark, 12-10-2003 14:05:24  
Sorry I goofed when I told you the hot side I should have told you the switched side, because if its draining your battery you need to be able to turn off that wire so to speak. I'm sorry I goofed but now you know what I should have told you. Hope this fixes the problem you have



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