Alternator Conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Minkota · 02-07-2020, 08:00 AM

My Voltage Regulator has failed yet again. I would like to convert to internally regulated Alternator. I have read several different posts that discussed how they have done this. what post or video is the safest and most reliable method of eliminating the voltage regulator. thanks

Mike C · 02-07-2020, 08:26 AM

Spend $20 on one of the “Conversion” plugs is the simplest and least chance of a mistake. Bypasses the regulator and adapts the exciter/sensing wire to the internal alternator. Add your 10si alternator in the 70 amp range and no need to change any wiring.

Minkota · 02-07-2020, 08:35 AM

Quote:

Originally Posted by Mike C

Spend $20 on one of the “Conversion” plugs

Where can I find this, Amazon?

I found this on Summit https://www.summitracing.com/parts/aww-27555

is this what you are referring too, but it looks really short.

Andy4639 · 02-07-2020, 09:25 AM

Everything is right here.

http://67-72chevytrucks.com/vboard/s...d.php?t=800471

Andy4639 · 02-08-2020, 09:06 AM

Quote:

Originally Posted by Minkota

Where can I find this, Amazon?

I found this on Summit https://www.summitracing.com/parts/aww-27555

is this what you are referring too, but it looks really short.

You don't need it this if done right. My first thread shows you how to convert it without buying anything but the alternator. It's one of the simplest things you can do to your truck. If you follow the thread it will be just like what you have now only with out the external stuff.

By the way this is how Mad electric does it also.

**Smitty** · 02-08-2020, 04:33 PM

My Volt Meter! Tbone Special.

rpmerf · 02-07-2020, 09:27 AM

Yes that is all you need. It jumps 2 sets of wires where the regulator would be and converts the part that connects to the alternator/generator. This is very easy / simple to do. Just plug and play. Easily reversible.

Lots of info on the 10si / 12si. The most valuable thing here is the part numbers.
http://www.madelectrical.com/electri...elcoremy.shtml

I ordered mine off Rock Auto. I got the 78 amp 12si 9:00.

Be aware the 10si / 12si top bolt is 10mmx1.5. I needed to grind the top bracket a bit for the bolt to fit.

**Smitty** · 02-07-2020, 10:00 AM

I got my conversion plugs ins from M & H Electric. Best money spent in some time! Santa Fe Springs, Ca. 562-926-9552 wiringharness.com.

Excellent products and customer service.

Minkota · 02-07-2020, 12:14 PM

Quote:

Originally Posted by Smitty

I got my conversion plugs ins from M & H Electric. Best money spent in some time! Santa Fe Springs, Ca. 562-926-9552 wiringharness.com.

Excellent products and customer service.

i just ordered mine, hopefully all the dead battery gremlins will be gone after this.

**Ol Blue K20** · 02-07-2020, 12:32 PM

Does the amp gauge work after the conversion?

**Smitty** · 02-07-2020, 02:35 PM

Not sure. But when I upgraded mine I upgraded the gauge to a volt meter. Because i’m Told this is needed because of higher output. Tbone did a killer job on my volt meter. Can’t tell the difference from the ampl gauge.

**Sheepdip** · 02-08-2020, 01:26 AM

Quote:

Originally Posted by Smitty

Not sure. But when I upgraded mine I upgraded the gauge to a volt meter. Because i’m Told this is needed because of higher output. Tbone did a killer job on my volt meter. Can’t tell the difference from the ampl gauge.

I second the volt meter, Tbone did mine also and it looks factory. Actually the factory should have put volt meters in them to start with.

**HO455** · 02-07-2020, 08:40 PM

Quote:

Originally Posted by Ol Blue K20

Does the amp gauge work after the conversion?

If you don't upgrade the wire sizes and the gauge worked prior to conversion then yes it should work. I upgraded mine with new wires and the calibrated resistance balance of the circuit was lost so now my gauge barely moves. I will switch to a voltmeter as that will be easier than trying to restore the balance of the system.
The link below goes to my repair thread scroll down to post 467 for a short write up with photos on my conversion.

https://67-72chevytrucks.com/vboard/...698377&page=19

**Ol Blue K20** · 02-08-2020, 01:03 AM

Quote:

Originally Posted by HO455

If you don't upgrade the wire sizes and the gauge worked prior to conversion then yes it should work. I upgraded mine with new wires and the calibrated resistance balance of the circuit was lost so now my gauge barely moves. I will switch to a voltmeter as that will be easier than trying to restore the balance of the system.
The link below goes to my repair thread scroll down to post 467 for a short write up with photos on my conversion.

https://67-72chevytrucks.com/vboard/...698377&page=19

Thanks for the info

**dmjlambert** · 02-08-2020, 01:14 AM

Quote:

Originally Posted by Ol Blue K20

Does the amp gauge work after the conversion?

If you don't connect accessories to the passenger fender terminal block or battery, and you don't upgrade the gauge or change the length (about 6 ft I think) of the 12 gauge red wire that runs across the top of the radiator between the passenger fender terminal block and the soldered junction that is wrapped with tape near the driver side headlight, then the amp gauge should operate fine. That section of 12 gauge wire is a specific resistance and it is the shunt that makes the ammeter work.

Willys_MB · 02-07-2020, 02:44 PM

I put a 12SI alternator on mine and did the three wire configuration instead. It was pretty simple, the board was very helpful.

**70STOVEBOLT** · 02-07-2020, 07:57 PM

Get a solid state regulator instead of the stock type and you won’t have any more problems.

**VetteVet** · 02-10-2020, 03:10 AM

This thread should cover all anyone needs to know about converting alternators.

http://67-72chevytrucks.com/vboard/s...d.php?t=763180

02-07-2020, 08:00 AM	#1
Minkota Registered User Join Date: Jun 2016 Location: West Palm Beach, Florida Posts: 295	Alternator Conversion My Voltage Regulator has failed yet again. I would like to convert to internally regulated Alternator. I have read several different posts that discussed how they have done this. what post or video is the safest and most reliable method of eliminating the voltage regulator. thanks

02-07-2020, 08:26 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	Re: Alternator Conversion Spend $20 on one of the “Conversion” plugs is the simplest and least chance of a mistake. Bypasses the regulator and adapts the exciter/sensing wire to the internal alternator. Add your 10si alternator in the 70 amp range and no need to change any wiring. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

02-07-2020, 09:25 AM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Alternator Conversion Everything is right here. http://67-72chevytrucks.com/vboard/s...d.php?t=800471 __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-08-2020, 04:33 PM	#6
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,124	Re: Alternator Conversion My Volt Meter! Tbone Special. Attached Images __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

02-07-2020, 09:27 AM	#7
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Alternator Conversion Yes that is all you need. It jumps 2 sets of wires where the regulator would be and converts the part that connects to the alternator/generator. This is very easy / simple to do. Just plug and play. Easily reversible. Lots of info on the 10si / 12si. The most valuable thing here is the part numbers. http://www.madelectrical.com/electri...elcoremy.shtml I ordered mine off Rock Auto. I got the 78 amp 12si 9:00. Be aware the 10si / 12si top bolt is 10mmx1.5. I needed to grind the top bracket a bit for the bolt to fit. __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

02-07-2020, 10:00 AM	#8
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,124	Re: Alternator Conversion I got my conversion plugs ins from M & H Electric. Best money spent in some time! Santa Fe Springs, Ca. 562-926-9552 wiringharness.com. Excellent products and customer service. __________________ Smitty '71 Short Fleetside Spring Valley, Ca. Last edited by Smitty; 02-07-2020 at 10:01 AM. Reason: Correct web address

02-07-2020, 12:32 PM	#10
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,242	Re: Alternator Conversion Does the amp gauge work after the conversion? __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

02-07-2020, 02:35 PM	#11
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,124	Re: Alternator Conversion Not sure. But when I upgraded mine I upgraded the gauge to a volt meter. Because i’m Told this is needed because of higher output. Tbone did a killer job on my volt meter. Can’t tell the difference from the ampl gauge. __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

02-07-2020, 02:44 PM	#16
Willys_MB Registered User Join Date: Apr 2017 Location: Boise, ID Posts: 856	Re: Alternator Conversion I put a 12SI alternator on mine and did the three wire configuration instead. It was pretty simple, the board was very helpful. __________________ 1968 GMC C2500 Long Bed Fleetside

02-07-2020, 07:57 PM	#17
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,353	Re: Alternator Conversion Get a solid state regulator instead of the stock type and you won’t have any more problems. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

02-10-2020, 03:10 AM	#18
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Alternator Conversion This thread should cover all anyone needs to know about converting alternators. http://67-72chevytrucks.com/vboard/s...d.php?t=763180 __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.



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