D15 gen
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=50101
Printed Date: 19 Aug 2025 at 11:48am
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Topic: D15 gen
Posted By: captaindana
Subject: D15 gen
Date Posted: 05 May 2012 at 6:13pm
| question for all you electron experts. I have had a rebuilt original D15II gen and new matched VR on my 15 Diamond in the rough. It has never shown a charge or discharge. I r&r VR cleaning/shining up how it's bolted to the battery box frame. I have removed the gen. I'd like to test the gen but the local shop isn't open till Mon and I don't want to wait. lol Any easy way for me to check and see if she's puttin' out correctly or should I work on something else 'till Mon? |
Replies:
Posted By: DEP5
Date Posted: 05 May 2012 at 6:16pm
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Using GOOGLE, search -> how to test a generator
------------- D10 Series III, fully optioned |
Posted By: Gerald J.
Date Posted: 05 May 2012 at 6:26pm
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Hook the generator to a battery (A and frame). With the field open it should run about 1500 RPM. Connect the field and it should run slower but have more torque. Check as a generator with a motor. With the field connected it should generate voltage. How much depends on the details of the design and the shaft speed. Ammeters can fail with the pointer pivots rusted fast. Check the ammeter by turning on the lights without the generator or without the engine running. If the lights light and there's no discharge indication, the ammeter is bad or not connected. Ammeters are cheaper than generators. And a better indicator of circuit function than a voltmeter. Gerald J. |
Posted By: captaindana
Date Posted: 05 May 2012 at 7:00pm
| Thanks Gerald. My ammeter isn't frozen...I can see it dance slightly, I removed all my lights so I can't check with them; hmmm let me think what I can hook up to where...to get a draw. Think I best not think till I get some rest loL! |
Posted By: CTuckerNWIL
Date Posted: 05 May 2012 at 8:44pm
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So if you had the generator rebuilt and put a new VR on, did you flash(polarize) the generator before running it?
------------- 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 |
Posted By: Gerald J.
Date Posted: 05 May 2012 at 10:16pm
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One of those headlights you removed is a decent test. Or a spare headlight lamp. Wire it to the terminal of the ammeter away from the battery wire. Gerald J. |
Posted By: captaindana
Date Posted: 06 May 2012 at 5:59am
| Thanks guys I am off to fix this...Charlie when I flashed it I thought I was arc welding without a helmut! It scared me; no little spark it was huge! |
Posted By: captaindana
Date Posted: 06 May 2012 at 8:57am
Many thanks as usual for the help! Thank you Gerald and Carl and Charlie. I fired her up after cleaning and reassembling everything and tracing wires. She went right up at charge to 10, then came back eventually to just positive. Lovin' it! Thanks again amigos!
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Posted By: CTuckerNWIL
Date Posted: 06 May 2012 at 9:03am
Cap'n, me thinks your traction booster gauge might not be working
------------- 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 |