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D-17 ignition
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BLee Mn View Drop Down
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Joined: 12 Sep 2009
Location: Montevideo Mn
Points: 680 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BLee Mn Quote  Post ReplyReply Direct Link To This Post Topic: D-17 ignition
    Posted: 01 Feb 2025 at 1:47pm
working on a 63 D-17 gas  it has a alternator instead of a generator and is hooked up as 12volt negative ground currently,  i think they were suppose to be pos ground,   or do they need to be 12volt neg ground with a alternator?

the coil is currently wired for pos ground


Edited by BLee Mn - 01 Feb 2025 at 1:48pm
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Stan R View Drop Down
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Joined: 03 Dec 2009
Location: MA
Points: 994 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan R Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2025 at 4:29pm
I converted our D17 IV to an alternator, negative ground. It used to be positive ground with a generator from the factory. Sounds like yours was converted.
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Points: 1385 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2025 at 5:23pm
Originally posted by BLee Mn BLee Mn wrote:

... do they need to be 12volt neg ground with a alternator?
Almost all alternators are set up to be Negative Ground.

Originally posted by BLee Mn BLee Mn wrote:

the coil is currently wired for pos ground

In theory they work better if you wire them for negative ground, but on low-performance engines like this it is likely that you couldn't really tell the difference.
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 12024 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2025 at 5:57pm
On Neg. ground systems, the wiring to the Coil is as follows:  Plus (+) side of the Coil to the Ignition switch. (IGN) terminal  minus (-) side to the Distributor.  If you have it still wired for pos ground, switch the wires around. You'll be good ta' go....  Thumbs Up
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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