Changing Alternaror

olthumpa · Mar 11, 2015

My Gen is going to have to be rebuilt or replaced in the next several mths. Had it rebuilt before. Now I'm thinking of going with an alternator for more amps and also to eliminating the voltage regulator. I have read several threads on here that talk about using a 10-SI or 12-SI Delco alternator. Looking for 45 - 60amps

Has anyone used a Duralast Alternator like the following one? It only has one wire that comes off the back. If you did, how did it work out? Instillation problems?
Just exploring my options at this point.
Thanks for any input.

http://www.autozone.com/batteries-starting-and-charging/alternator/duralast-alternator/264222_0_0/

re54drider · Mar 11, 2015

I have converted both a 1963 Ford pickup and a 1954 MF135 to alternators. I just used an extra GM alternator I had and ran a wire from the output post to the exciter connector. Making the mounting brackets was a bit of a pain but doable. The single wire alternator is pretty much plug and play once installed the the old regulator deleted.

olthumpa · Mar 11, 2015

Thanks for your reply.
I do have a 100amp GM alternator but I would have to fab up an upper and lower bracket. Also, it's physical size is to large.

Dave_eng · Mar 11, 2015

olthumpa said:
My Gen is going to have to be rebuilt or replaced in the next several mths. Had it rebuilt before. Now I'm thinking of going with an alternator for more amps and also to eliminating the voltage regulator. I have read several threads on here that talk about using a 10-SI or 12-SI Delco alternator. Looking for 45 - 60amps

Has anyone used a Duralast Alternator like the following one? It only has one wire that comes off the back. If you did, how did it work out? Instillation problems?
Just exploring my options at this point.
Thanks for any input.

The Duralast you show is just a clone of the 10SI style GM alternator.
I have converted a number of tractors and trucks to the GM unit with great success. As far as your 100 amp existing one you have hanging around, if you try using it there are a number of problems that will rear up quickly. Having the belt drive adequate to turn the alternator is a big challenge. You are asking the original drive pulley on your engine to handle the power transfer many times what it was designed for. The V belt will slip and overheat when asked to power a true 100 amps.
Stick to the lower amperage GM unit around 40 amps and all will work out easily. You can very simply convert a 3 wire GM to a 1 wire system as shown on the link I am providing. A 4" piece of wire is all that is needed.
http://bob_skelly.home.comcast.net/~bob_skelly/alternator_conversion/wiring_alternator1.html
Focus on converting to LED lighting to lower your power needs rather than trying to power halogen lights of high power.

Dave M7040

North Idaho Wolfman · Mar 11, 2015

I add one of those to my B7100, works like a charm!

olthumpa · Mar 11, 2015

Re: Changing Alternator

Thanks Dave and Wolfman.

I knew that the 100 would be to large both in size and demand more then the belt could deliver. Yes, I do intend on transitioning to LED. Destroyed the lights I had on the ROPS

and all the wiring needs to be upgraded. I had planned on doing it last year but sometimes life gets in the way. I haven't decided if I am going to keep the original fuse block of 4 fuses or update it and add a couple extras.

I do want to keep this as simple as possible while getting the results that I want, more amps, eliminating the regulator and simplifying the wiring. Give me a house and I will wire it top to bottom with out any problem, automotive I have never developed a like or the skills for.

Do you, or anyone else, know of an alternator that will bolt right up - part#?

Thanks again.

North Idaho Wolfman · Mar 11, 2015

All the alternators that I can find that have internal regulators are 2 tab mounts nothing in the three tab like yours.

olthumpa · Mar 11, 2015

North Idaho Wolfman said:
All the alternators that I can find that have internal regulators are 2 tab mounts nothing in the three tab like yours.

Thanks for looking Wolfman, I wasn't having any luck and hoped someone else would have better luck than I did.

Dave, that was a great link and plenty of info.

I guess fabing up brackets it will be.

Tooljunkie · Mar 11, 2015

I need to add- the horsepower needed to run a larger alternator is quite substantial. Like ten horsepower under full load. The delcos need to turn 1000 rpms to excite. One wire- put sense wire closer to load than to battery, will perform better.

olthumpa · Mar 11, 2015

Thanks for your reply Tooljunkie.
In the link that Dave provided it suggests a way to do just that.

Tooljunkie · Mar 11, 2015

Yup,thats almost exactly what i was thinking,shoulda read it. Been a while since i have had to deal with these.

Buddy had 2 combines with constant alternator problems-was running 1 wire delcos, thought was the answer. Was, in fact not the answer. Took some convincing to go back to 3 wire and invest in matched batteries. Refused to replace failed battery with one that matches existing one.

olthumpa · Mar 15, 2015

Well, I think the decision and timing have been decided for me. Yesterday the charging light came on and stayed on.
What I have done:
Last night I checked the battery -12.4 volts
Checked the alternator with the tractor running - 12.4 volts
Plugged in battery tender and left on all night until 12:30 pm

Checked battery with tender attached 13.20 volts at battery and 13.20 volts at starter
Unplugged battery tender and let the tractor set for 20 min.
Checked battery voltage 12.9 volts
Glow plugs for 45 seconds and then started tractor
Checked voltage at battery, starter and from alternator post to ground, all readings 12.70 volts
Voltage at idle, 1100rpms and 2500rpms all 12.70 volts at battery, starter and from alternator post to ground

Continuity test for three wires from alternator to regulator all good
Continuity test from alternator to starter also good
Do not know how or if a regulator can be tested

Battery cables new and over sized about 2 years ago

Am I missing anything?

10SI alternators are available with 37amp, 42amp, 55amp, 61amp, and 63amp ratings

12SI alternators are available with 56amp, 66amp, 78amp, and 94amp maximum output ratings.

56 amp 12SI are harder to find and more $$.
Pros and cons of 10si and 12si?

Best suggestion for my L275.

Any suggestions for parts that should also be changed and sourcing?
Will be rewiring everything while I am at it.

Tooljunkie · Mar 15, 2015

10 SI alternator is a slightly smaller case if i recall. I dont have any to compare right now.

North Idaho Wolfman · Mar 15, 2015

Since you have to remake/ alter the mount how about this?
Alternator:
http://www.ebay.com/itm/291131509604?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Plug:
http://www.ebay.com/itm/Alternator-...Parts_Accessories&hash=item259f6fbeaf&vxp=mtr

This setup works well for the RPM range of the tractor.
And it is much smaller than the GM alternator, but yes a little more $$.

Tooljunkie · Mar 15, 2015

That price isnt bad,cant buy a delco for that here.

Dan_R_42 · Mar 16, 2015

North Idaho Wolfman said:
Since you have to remake/ alter the mount how about this?
Alternator:
http://www.ebay.com/itm/291131509604?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Plug:
http://www.ebay.com/itm/Alternator-...Parts_Accessories&hash=item259f6fbeaf&vxp=mtr

This setup works well for the RPM range of the tractor.
And it is much smaller than the GM alternator, but yes a little more $$.

Wolfman, Will that alternator be a good fit for a B7100 or is its size too big for a B7100-D retrofit?

Anyone happen to have the rough dimensions for this alternator ?

Dan

Grumpy560 · Mar 16, 2015

Dan_R_42 said:
Wolfman, Will that alternator be a good fit for a B7100 or is its size too big for a B7100-D retrofit?

Anyone happen to have the rough dimensions for this alternator ?

Dan

That one is a perfect size for the B7100 it just depends on whether you want to cut up the side panel to mount it or do like I did and mount the alternator on top. You will need a dual V belt pulley on the alternator if you go the way I did.

North Idaho Wolfman · Mar 16, 2015

That alternator is really small about 4" diameter and about 6" long.
So yea I would say it's perfect for The b7100 change too.

Dan_R_42 · Mar 16, 2015

Grumpy560 said:
That one is a perfect size for the B7100 it just depends on whether you want to cut up the side panel to mount it or do like I did and mount the alternator on top. You will need a dual V belt pulley on the alternator if you go the way I did.

Thanks, Wolfman and Grumpy.

Do you happen to know if a dual V belt pulley will fit this shaft or do I need a longer shaft alternator of the same style?

Grumpy560 · Mar 16, 2015

Dan_R_42 said:
Thanks, Wolfman and Grumpy.

Do you happen to know if a dual V belt pulley will fit this shaft or do I need a longer shaft alternator of the same style?

I paid $113.00 for my alternator and it came with a dual V belt pulley installed already.

Changing Alternaror

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