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Hd11 alternator/generator conversion
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Argo2 View Drop Down
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Joined: 28 May 2010
Points: 37 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Argo2 Quote  Post ReplyReply Direct Link To This Post Topic: Hd11 alternator/generator conversion
    Posted: 28 May 2010 at 6:31pm
Wanted to change the positive ground 24 volt generator out to be replaced by a 24 volt delco alternator. Got mounts all made but belt width is a problem so used the pulley from the generator. The problem is that the diameter of the old pulley is to big and with the reduced speed of a diesel can't get the alternator to perform. Has anyone succeeded in changing to an alternator on the HD11? Or does anyone know where I can get a c belt size pulley with a 5/8 id shaft size?

Argo2
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22824 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2010 at 10:10pm
Order what you want here. http://www.mcmaster.com/#pulleys-for-belts/=7akovw
http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Points: 41817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2010 at 10:17pm
On my HD5 I used a cast iron pulley from truck alt, machined it out to fit B width belt.
It was about half the diameter of origonal generator pulley .
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Points: 37 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Argo2 Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2010 at 11:30pm
What particular truck alternator did you get pulley from?
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DonBC View Drop Down
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Points: 930 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DonBC Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2010 at 1:45pm
I have a similar problem with the alternator on my D grader. When I posted this question a while ago someone responded that they sell B width sheaves for alternators and someone else said that they split the stamped metal sheave in half and put some washers in between to make it fit a B width belt. I am going to try the later.
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Coke-in-MN View Drop Down
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Points: 41817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2010 at 10:51pm
Pulley was from 78 GMC with the 427 or 366 with air comp.  Pulley is small diameter with a recess machined into it to attach to alt shaft and allow for nut to fasten to shaft.
 It was thick enough and sets forward far enough to allow the larger belt, so belts clear the fan plate on alt.
 I believe there is a way to overcome the internal regulator also to excite the stator so it will charge at low RPM. I know on HD5 I have to run engine up to full RPM to get it to kick in but then it will charge at idle after excited.

Edited by Coke-in-MN - 29 May 2010 at 10:56pm
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Points: 37 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Argo2 Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2010 at 7:42am
Thanks a bunch. Yes there is a regulator out there that will fix this problem from idle but as yet I have been unable to track down the company and unfortunately I didn't bookmark it when I read about them. I'll post it if I find it again. Thanks though. I will get one of these pulley's for now.
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Points: 930 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DonBC Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2010 at 12:46pm
If it is an alternator with a built in regulator and you are told that they only need one wire connection they do not work well at low rpm. My D grader was set up this way. I got the adaptor for the two unused terminals on the alternator from an auto parts store. One lead connects to the battery terminal on the alternator and the second lead requires a light gage wire to a terminal that senses your battery voltage such as a key switch. Since my engine is a gas engine I connected it to the ignition terminal of my key switch so that it broke the connection when the key was turned off. I had to install a diode in line to prevent the alternor from back feeding voltage to the coil after the ignition switch was turned off. My alternator now starts charging as soon as the engine starts even if it only running at a slow idle.
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