Topic: 38A or 42A Alternator

[CharlesTurner]

Starting a new topic as the post regarding correct battery is getting more into a discussion about alternators.

For 65-66, the assembly manuals list either a 38A or 42A alternator, with the 42A being an RPO.  The 65 assy manual shows the RPO as Z-102, but the 66 one shows Z-120.  Not sure if that is a typo, or if the RPO is just for the alternator or part of a different option.

The discussion for this topic is surrounding how a specific car would have been equipped with the optional 42A alternator.  Based on some original examples, A/C, power top, nor the HD battery option appear to have 'triggered' an automatic alternator upgrade. 

Build sheets have a place for the alternator, blank would be a 38A and I believe '8' would be for a 42A.  Would be great if anyone has build sheets with the 8 for 42A alternator to share.  Maybe we can determine a pattern?

Also, related to the discussion, the 65-66 assembly manuals do not call out a different voltage regulator for either the 38A or 42A alternator.  This would mean all 65-66 should have the silver ink-stamped regulators, C5AF-10316-A.

[krelboyne]

Maybe fog lights?

[jwc66k]

Maybe fog lights?

That would include 65-66 Mustangs with the the GT option, and none of the several GT's I've owned have it listed. See the window sticker.
Jim

[jwc66k]

The 65 assy manual shows the RPO as Z-102, but the 66 one shows Z-120. 

The 65 Mustang Electrical Assembly Manual, AM0008 pg 11 shows the option reference for the battery as O-106 for a C5AF-10655-B 55A battery.
The 66 Mustang Electrical Assembly Manual, AM0013 pg 17 shows the option reference for the battery as Z-106 for a C5AF-10655-B 55A battery.
Consistently inconsistent.
Jim

[Bob Gaines]

Starting a new topic as the post regarding correct battery is getting more into a discussion about alternators.

For 65-66, the assembly manuals list either a 38A or 42A alternator, with the 42A being an RPO.  The 65 assy manual shows the RPO as Z-102, but the 66 one shows Z-120.  Not sure if that is a typo, or if the RPO is just for the alternator or part of a different option.

The discussion for this topic is surrounding how a specific car would have been equipped with the optional 42A alternator.  Based on some original examples, A/C, power top, nor the HD battery option appear to have 'triggered' an automatic alternator upgrade. 

Build sheets have a place for the alternator, blank would be a 38A and I believe '8' would be for a 42A.  Would be great if anyone has build sheets with the 8 for 42A alternator to share.  Maybe we can determine a pattern?

Also, related to the discussion, the 65-66 assembly manuals do not call out a different voltage regulator for either the 38A or 42A alternator. This would mean all 65-66 should have the silver ink-stamped regulators, C5AF-10316-A.

Charles , the C5AF (C8AF for 68-70) marked silver stamped regulator was used on the 38 or 42 amp alternator from 65-70 Mustang according to the various year specification manuals. The C5TF yellow stamp regulator (C8TF for 68-70) was paired with the 55 amp alternator.

[CharlesTurner]

Charles , the C5AF (C8AF for 68-70) marked silver stamped regulator was used on the 38 or 42 amp alternator from 65-70 Mustang according to the various year specification manuals. The C5TF yellow stamp regulator (C8TF for 68-70) was paired with the 55 amp alternator.

I was pointing that out as I recall somewhere it was stated (not here) that power top or A/C cars should have the yellow stamp regulator for 65/66, which does not appear to be correct... and as you point out was paired with a 55A, which wasn't available on 65-66 cars.

[sgl66]

 

Build sheets have a place for the alternator, blank would be a 38A and I believe '8' would be for a 42A.  Would be great if anyone has build sheets with the 8 for 42A alternator to share.  Maybe we can determine a pattern?

My build sheets have the “8” for alternator which according to the buildsheet thread is for 42A and standard for HiPo cars http://www.concoursmustang.com/forum/index.php?topic=3925.30

I also have a “2” in the battery section on the build sheet and the HD battery on the dealer invoice.

If it’s true that HiPo cars by default came with 42A alternators, did they also come with HD batteries? I’m trying to think of why you would have one without the other on a HiPo car or any car?

[CharlesTurner]

More info:

Build sheets:
66 A code GT, 38A, HDB (heavy duty battery)
66 A code GT, 38A, HDB
66 K code GT, 42A, HDB (code 2)
66 K code, non-GT, 42A, HDB
66 A code GT, illegible, HDB (code 2)

Window stickers:
64.5 K code, no HDB

65 K code, non-GT, (5) without HDB, (1) with HDB

66 K code, GT (2) with HDB
66 K code, non-GT, no HDB


This doesn't really help with much other than maybe starting in 66, the 42A became a requirement for K codes.

[J_Speegle]

Will try and find a little time to go through the buildsheets and window stickers I have to share and help out a little

[sgl66]

Thanks, I still think cars delivered to colder climates may factor in to the HDB equation and worth keeping an eye on.

Also wonder if the higher compression and heavier springs on the HiPo made them shift to the HDB in 66 if issues popped up in 65? guessing of course

[J_Speegle]

Thanks, I still think cars delivered to colder climates may factor in to the HDB equation and worth keeping an eye on.

Won't close my eye to the watch for something. That is how we learn/discover new things or reinforce current belief's

[PerkinsRestoration]

Both 69 & 70 Boss 429 use 55 AMP alternator and use C8AF 10316-A regulator. All nos Autolite service regulators were TF type with yellow print. I believe it was very common  C5AF-10316-A and C8AF-10316-A regulators were replaced by the service TF regulators at some point.

[Bob Gaines]

Both 69 & 70 Boss 429 use 55 AMP alternator and use C8AF 10316-A regulator. All nos Autolite service regulators were TF type with yellow print. I believe it was very common  C5AF-10316-A and C8AF-10316-A regulators were replaced by the service TF regulators at some point.

Bob ,I don't dispute what you have seen . I have heard your opinion on this subject before. I just assume it is a anomaly limited to a few applications like the Boss 429 . Yes every NOS service regulator I have ever seen had a C5/C8TF yellow stamped regulator inside the pull string to open box. I figured service options in this regard differed from assemblyline because of Ford cost savings because of lower inventory different numbers.     Just reporting what the 65-70 service specifications books read.  I posted a picture from page 14-2 of the 69 book for example that reads 38,42 amp alt had the silver C5/C8AF and 55 amp alt had the yellow stamp C5/C8TF. The other year books read the same. Don't shoot the messenger.

[PerkinsRestoration]

Bob, I think your info  apply's prior to 1969 model year as Boss 302's, Boss 351's and most 428 CJ's  typically had AF regulators. I have never seen a yellow TF on a Boss 302,351,429 or 69/70 428CJ. Even the unrestored 70 Mach 1 with AC has a Silver AF. It also has the original battery born with in the car.  I don't believe the C8AF and later regulators were adjustable either? The old Bob Graff 6,000 mile white GT 500 has a silver C8AF regulator . No doubt an original AF regulator with original paint is much more rare find than a TF. Most but not all my observations are DAP cars except 1970 Boss 302.

[krelboyne]

If it’s true that HiPo cars by default came with 42A alternators, did they also come with HD batteries? I’m trying to think of why you would have one without the other on a HiPo car or any car?

Comment on the HiPo alternators. They had larger diameter pulleys, I reckon that may have something to do with them being a higher output?
I don't understand electronics, but worth mentioning.