Farm Equipment - 12 volt

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12 volt

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Topic: 12 volt

Posted By: Tripp
Subject: 12 volt
Date Posted: 11 Oct 2011 at 6:51am

I'm having problems getting my 12 volt alternator to start charging below 1000 rpms, it won't kick in till 1400. Any ideas?

Replies:

Posted By: Stan IL&TN
Date Posted: 11 Oct 2011 at 6:55am

Install a smaller pully on the alternator.

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1957 WD45 dad's first AC

1968 one-seventy

1956 F40 Ferguson

Posted By: Tripp
Date Posted: 11 Oct 2011 at 7:04am

Already has the smallest. Anything else.

Posted By: CTuckerNWIL
Date Posted: 11 Oct 2011 at 7:06am

I used an alternator off an old Blazer. Never needs revved up to work. A smaller pulley on the alternator will help, live with it, or replace the alternator. It don't take much to wind her up a bit after the oil pressure gets up good. :)

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: Rfdeere
Date Posted: 11 Oct 2011 at 7:34am

Is it a one wire alternator ?

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Randy Freshour,Member Indiana AC Partners,
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Posted By: Jeff Z. NY
Date Posted: 11 Oct 2011 at 7:59am

Tripp, What is the diameter of the pulley you have.

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I Love Meatballs and Dumplings on Toast with Gravy and Rosemary and ??? {Open For Suggestions}

Posted By: Gerald J.
Date Posted: 11 Oct 2011 at 10:29am

Most one wire can be wired with an additional wire to the ignition circuit through a lamp, diode, resistor to start charging at low rpms. Otherwise having to goose the engine to get charging started is normal for 1 wire alternator. A cost of simplicity. You need the lamp, diode, or resistor to keep the alternator from back feeding the ignition and preventing you stopping the gas engine. On a diesel and you can do it on a gas, a switch that closes on oil pressure rise can connect the excitation wire to the alternator. I know NAPA has a suitable switch, but its been a while since I looked it up and I don't remember their part number. I have one here somewhere for some planned project.

Gerald J.

Posted By: Tripp
Date Posted: 11 Oct 2011 at 10:43am

It's a 3 wire. Pulley is about 2.5 to 3 inches.

Posted By: Jeff Z. NY
Date Posted: 11 Oct 2011 at 10:47am

If it is three inches you can get a 2 1/2 inch pulley.

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I Love Meatballs and Dumplings on Toast with Gravy and Rosemary and ??? {Open For Suggestions}

Posted By: CTuckerNWIL
Date Posted: 11 Oct 2011 at 11:03am

Jeff, I made my own on the 45. I didn't want the alternator hanging out the front of the genny bracket, so I made a longer hub and cut the pulley to the same size as the old genny pulley.

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: wfmurray
Date Posted: 11 Oct 2011 at 11:06am

I run a wire from the term to excite it to switch on dash . Crank it up turn on switch and turn switch back off, will charge untill you cut motor off. Should have used push button . Leave it on and it will drain battery when stored .Using switch saves reving a cold engine.

Posted By: Gerald J.
Date Posted: 11 Oct 2011 at 12:47pm

Diode, resistor, or lamp to the ignition circuit does the same function as the switch and does it automatically.

Gerald J.

Posted By: DonBC
Date Posted: 11 Oct 2011 at 12:51pm

If it already is a 3 wire setup possibly the diode is burnt out.

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Jack of all trades, master of none

Posted By: Steve in NJ
Date Posted: 11 Oct 2011 at 2:04pm

If you have a three wire Alternator on it, you shouldn't have any problems charging. If its not charging as soon as you start the engine, there's an internal problem with the Alternator, unless its not wired correctly. Most one wire Alternators do not charge till the rpm's reach 1200-1400. A Diode or lamp can be used down stream to eliminate the Igniton back feed as mentioned. Also use an Ignition switch to control power on board the Tractor to eliminate any parasitic draws. With the Igntion switch controlling power, once the switch is shut off, everything should be off. HTH

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