Delco 24si alternator install on nhc250

BenRoberts

Certified insane
1,367
194
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Location
southwest/ohio
Got a 24si alternator from 74m35a2 and here is how the installation went. On first mock up it was clear the pulley was going to sit to far forward. To combat this the bracket was removed and machined to make it adjustable 123_1.jpg next since the 2 tabs for mounting on the bottom of the alternator were nowhere close to fitting the stock bracket a new spacer was machined with a 3/8 hole. I went with a 3/8 hole to make the spacer more stout. Before spacer IMG_20170318_175815228.jpg after spacer IMG_20170318_185231411.jpg since this unit has a smaller pulley shorter belt were a must to get proper tension on the belts. I found napa 7460 to work just fine IMG_20170318_180140320_HDR.jpg the larger pulley off the stock unit I was informed would not change properly at idle. No modification is needed on the top bracket. It's flexible enough to bend as the lower bolts are tightened. IMG_20170318_185236921.jpg as far as electrical goes if using the stock wiring the plug in exciter wire from the PCB is not used and will be tied up out of the way. The small wire is power and the slightly bigger wire grounds to the case. I bigger eyelet on the power wire will be necessary. Alt performs great and I hope I covered it all. Not a bad install at the end of the day.
 

74M35A2

Well-known member
4,147
269
83
Location
Livonia, MI
Glad you like it. I have a shorter pulley available next time, this was kind of an experimental install of a nice compact modern unit onto a 250 engine. Bracket slots were a great idea!

I do have one more of these units available for a bargin basement price. Genuine Delco unit, not Chinese. Will fit 8.3L or 250, with bracket mods or civilian bracket.

Great output, single B+ wire operation, twin internal fans, light, compact, fail-safe, and reliable. They do not over-volt. Ben can now shut his truck off in any switch order safely, and not wipe out his ABS module.
 
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Dwnorton1

New member
392
0
0
Location
Healdton Oklahoma/ SOOK
Installed one on M813A1, NH250. Truck came without alternator. Stock belts worked fine, which is blessing because it would take 1/2 day to get everything loosened up to install new ones. Had to add one washer as a spacer or rear of bracket. Ordered the one listed for the for M35 multifuel. Cannot beat the price. Will send some pics when I get home.
 

74M35A2

Well-known member
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269
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Location
Livonia, MI
The unit above appears to be a Chinese Delco clone. I don't think that one was sourced through me (which is OK, I don't care), as I only had one Chinese unit for benchmarking, and it sold to a guy in an emergency need for a low cost unit.

There are 2 different common pulley stand-off heights available. I don't have access to a 250 engine, so just trying to guess as to what is needed. Have to fab the mount somewhat anyway. Still worth it in the end, even with a clone unit.

Ben, you did a great job on your bracket. Always encourage adjustability.
 
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