G pos or neg ground?
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Topic: G pos or neg ground?
Posted By: Thad in AR.
Subject: G pos or neg ground?
Date Posted: 24 Apr 2010 at 1:04pm
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I bought a battery for my G today and don't know if it is pos or neg ground. It has the original gen and a cutout. Also where should it ground? it has a light duty cable that goes to the battery box. Thanks for any help. Thad
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Replies:
Posted By: Kevin(Alabama)
Date Posted: 24 Apr 2010 at 1:09pm
Mine is positive ground. I'm not sure of where its grounded but I would ground it to the frame or bell housing.
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"I would die a thousand deaths before I would betray a friend."...Sam Davis, Nov. 27, 1863.....DEO VINDICE
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Posted By: CTuckerNWIL
Date Posted: 24 Apr 2010 at 3:32pm
Mine is grounded to the battery box too. I think that is a problem waiting to happen, just like putting light weight cheap cables on a 6V system. The G's were positive ground. It wouldn't hurt to check which side of the coil goes to the points. If - goes to points it may have been changed to neg ground. In any case it wouldn't hurt to polarize the gennie before firing up the first time.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: Gerald J.
Date Posted: 24 Apr 2010 at 4:59pm
If it has the original cables they should fit the posts far better one way than the other. The posts are different sizes to make that hint.
Another test is to connect the battery and turn on a light or the ignition with the points closed and see if the ammeter shows discharge or charge. If it shows discharge without the engine running, the polarity of the ammeter and the battery match.
Gerald J.
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Posted By: Thad in AR.
Date Posted: 24 Apr 2010 at 6:08pm
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Ok guys I got it started and when I pull the light switch all the way out it shows a discharge. With the light switch off it shows nothing. The neg post on the coil goes to the dist and I hooked the cables up neg ground. The cables look like they came from walmart. Tomorrow I will switch the coil wires and make it pos ground. Then how do I polarize. Thanks much
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Posted By: Gerald J.
Date Posted: 24 Apr 2010 at 6:41pm
You will also need to swap the connections at the ammeter. Polarization is a little specific to particular voltage regulator circuits so you need the instructions for the G.
That discharge test has to be run with it NOT running to make it meaningful on an AC.
Gerald J.
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Posted By: CTuckerNWIL
Date Posted: 25 Apr 2010 at 7:37am
Gerald, He says it has the cut out relay. What would be specific about polarizing a G with the cut out?
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: Gerald J.
Date Posted: 25 Apr 2010 at 10:08am
My wild guess is that its important to have the light switch full on for maximum field when polarizing, then to jumper the terminals on the cutout to temporarily apply batter voltage to the generator fields and armature to set the build up polarity, but there could be other details necessary. It only needs half a second of solid jumper to do the job, most of the time, but you need to be sure to get plenty of field current by having the light switch on when that's what is setting the charge rate in that vintage AC tractor.
Gerald J.
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Posted By: Dave(inMA)
Date Posted: 11 May 2010 at 5:13pm
Can you ground the field terminal on the gennie to ensure that you have full field current flow?
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WC, CA, D14, WD45
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Posted By: Chalmersbob
Date Posted: 11 May 2010 at 9:34pm
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If you jumper the terminals on the cutout you are connecting the battery to the armature you are in affect polorizing the genny. To polarize the genny you are to momentarly jump the battery terminal to the armature terminal. You should see a blue spark. The last regulator that i installed, it wouldn't polorize. I had to jump it several times until it started to work. Bob
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