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jiminnd 
Orange Level
Joined: 16 Sep 2009
Location: Rutland ND
Points: 2227
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 Topic: D 15 series 2?
Posted: 18 Aug 2023 at 4:01pm |
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Were they 12 volt negative or positive ground? My own fault, robbed the battery for another and don't remember.
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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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DrAllis
Orange Level Access
Joined: 12 Sep 2009
Points: 20187
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Posted: 18 Aug 2023 at 5:15pm |
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From the factory with a generator??.....POSITIVE ground.
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 4597
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Posted: 19 Aug 2023 at 6:38am |
You can check to see what it was before you removed the battery. A lot of them were changed from original positive ground to negative ground.
If the wire going from the coil to the distributer is attached (through the switch) to the negative terminal, it is (as original) positive ground. If it has been changed to negative ground, the wire going to the distributer will positive pole of the battery.
Changing from positive ground to negative ground is very easy. Just change the wires on the coil (so the opposite polarity is going to the distributer) and "flash" the generator.
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jiminnd
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Joined: 16 Sep 2009
Location: Rutland ND
Points: 2227
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Posted: 20 Aug 2023 at 11:39am |
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It was converted to alternator, I am still confused, the negative from the coil goes to the distributer, does that tell you anything?
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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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DonDittmar
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Joined: 15 Sep 2009
Location: MIllersburg, MI
Points: 2479
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Posted: 21 Aug 2023 at 5:46am |
 jiminnd wrote:
It was converted to alternator, I am still confused, the negative from the coil goes to the distributer, does that tell you anything? |
Yes. It tells us the ignition system is set up NEG ground
General rule of thumb-if you see an alternator its negative ground.
Be careful with that rule, because an alternator can be taken apart and made to charge POS ground, however out of the box they are set up to charge NEG ground
Generators will charge either without changing any parts, just have to reflash the VR Starters do not care
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Acdiesel
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Joined: 15 Jun 2012
Location: Rochester Ohio
Points: 2545
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Posted: 21 Aug 2023 at 11:03am |
another quick tip: the positive and negative post on a battery are different sizes. unless someone changed the cable ends or put cheap bolt on cable ends, the negative is smaller than the positive.
Dan
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D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf
D15 SER.2 DIESEL,D15 ser.II nf
D12 SER.I, D10 Ser.II
2-720'S
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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