D-17 ignition
Printed From: Unofficial Allis
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=205217
Printed Date: 28 Jul 2025 at 1:57am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D-17 ignition
Posted By: BLee Mn
Subject: D-17 ignition
Date Posted: 01 Feb 2025 at 1:47pm
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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 ------------- Cowboy UP |
Replies:
Posted By: Stan R
Date 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. |
Posted By: Les Kerf
Date Posted: 01 Feb 2025 at 5:23pm
Almost all alternators are set up to be Negative 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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BLee Mn wrote:Posted By: Steve in NJ
Date Posted: 01 Feb 2025 at 5:57pm
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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....  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 |