d17 voltage reg
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=26984
Printed Date: 27 Feb 2025 at 4:30am
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Topic: d17 voltage reg
Posted By: farmer_rob
Subject: d17 voltage reg
Date Posted: 08 Mar 2011 at 7:49pm
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the original regulator still works but both the mounts are off. i bought another one that was suppose to fit but while i was getting ready to install it i noticed on the bottom of it said Neg ground. well i know the tractor has a pos ground system so i called the dealer. he told me to go ahead and install it but reverse the battery cables so the tractor will be now neg ground. he also mentioned that i would have to switch the wires on the amp gauage aswell.. im wondering if this new regulator would make any differnce providing everything esle was the same as in direction of current. sorry for the long post.
i dont want to start butchering the tractor so i hope you guys says to just go ahead and install and im over thinking
thanks rob
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if farming was easy everybody would be doing it
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Replies:
Posted By: allis restorer
Date Posted: 08 Mar 2011 at 8:53pm
do you have a generator or an alternator?, a generator needs to be set up with a positive ground.
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Go orange or Go home!!
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Posted By: farmer_rob
Date Posted: 08 Mar 2011 at 10:45pm
i have a generator but i was told it didnt matter which way is was set up
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if farming was easy everybody would be doing it
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Posted By: allis restorer
Date Posted: 08 Mar 2011 at 10:49pm
im not sure, i could be wrong, but i do know that you cannot take a battery that has been run positive ground and hook it up negative ground, it will give you all kinds of trouble in no matter of time.
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Go orange or Go home!!
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Posted By: allis restorer
Date Posted: 08 Mar 2011 at 10:52pm
and also if you do switch to negative ground you need to switch the wires on the coil otherwise the coil will blow apart.
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Go orange or Go home!!
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Posted By: Gerald J.
Date Posted: 08 Mar 2011 at 11:07pm
Not quite so. The original type of regulator fundamentally isn't polarity sensitive, but is often made with different contact materials for lower cost and then since one side of a contact pair tends to wear faster, that side gets the better material and that's what makes a regulator rated for negative ground or positive ground, providing its a magnetic type regulator of yore. If its a modern solid state regulator hidden in a magnetic package as many are for automobile replacement, it won't tolerate reversed polarity for a microsecond. A flash and its gone and the parts place has a prominent sign that says, "No returns on electrical products." Sell you the wrong part and you apply it in a way that it doesn't survive, you lose.
If the regulator can operate at either polarity, it just takes reversing the battery, the ammeter and the coil primary terminals. Trouble is the battery posts are made fat and thin to make that difficult, to guide you to the proper polarity. So its really better to change the cables too. The ammeter won't blow up if run reversed polarity, it will just read backwards. The coil WILL NOT blow up with reversed polarity (though a solid state igntion has only a microsecond lifetime with reversed polarity), it will just give a less hot spark, but will give a spark. The vintage starter doesn't care what the polarity is, though the most modern permanent magnet car and truck starters will turn backwards with reversed polarity.
With any regulator connected you MUST flash the generator to make it build up voltage in the proper polarity if you change the battery polarity, and if the generator has been setting a while that's a good idea, vital if its been run on a shop or store test stand.
Gerald J.
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Posted By: allis restorer
Date Posted: 08 Mar 2011 at 11:24pm
Gerald your right, im thinking of when you put a alternator on that the coil can blow, a generator probably dont have enough amps to do that.
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Go orange or Go home!!
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Posted By: farmer_rob
Date Posted: 08 Mar 2011 at 11:45pm
i should have mentioned earlier that is a series 4 diesel if that makes it clearer
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if farming was easy everybody would be doing it
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Posted By: CTuckerNWIL
Date Posted: 08 Mar 2011 at 11:57pm
a generator needs to be set up with a positive ground. Wrong
A generator can be run with positive or negative ground.
i do know that you cannot take a battery that has been run positive ground and hook it up negative ground Wrong Any battery can be taken from a positive ground vehicle and put in a negative ground vehicle and visa versa if the generator is polarized to the proper ground.
also if you do switch to negative ground you need to switch the wires on the coil otherwise the coil will blow apart.
Wrong Even with an alternator, the coil will not blow up by running the polarity wrong. Your points my not last as long as usual but it will not blow up. What will eventually ruin a "6" volt coil is running 12 volts to it. It will normally work for a short time and get hot but I have never heard of one blowing up.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: CTuckerNWIL
Date Posted: 09 Mar 2011 at 12:05am
Rob, if you change to negative ground, be sure to polarize the generator before starting the engine for the first time.
With any regulator connected you MUST flash the generator to make it
build up voltage in the proper polarity if you change the battery
polarity, and if the generator has been setting a while that's a good
idea, vital if its been run on a shop or store test stand.
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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: 09 Mar 2011 at 2:57am
There's no coil on a diesel to worry about.
Gerald J.
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