Is there more than one brush and holder set for the 37- to 63-amp 10DN alternators? I have a Standard Auto RX99A replacement set that seems to fit all except 63-amp for some reason (according to some web sites but not all).
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Try this another way
What differentiates a 37-amp 10DN alternator from a 63-amp alternator? Stator? -
Re: Try this another way
Paul------
The same brush holder/brush set was applicable to all 37 through 61 amp series 10DN alternators. This brush and holder assembly, known as Delco #D-722 and GM #1964682 is discontinued through GM. However, I believe that it's still available through Delco. However, it's currently very likely the Standard Auto Parts-manufactured piece that you already have.
No 63-68 Corvette ever used a DN series alternator that was greater in capacity than 61 amps. So, the above brush holder assembly will work for any Corvette alternator.
As far as alternator above 61 amps during the 63-68 period, I don't know that they were series 10 DN. It's possible that they were, but I suspect that they were not. Those alternators do use a different rotor and different stator. I suspect that they are another DN series unit. None were ever used in a Corvette, though.In Appreciation of John HinckleyComment
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Re: Try this another way
Thanks Joe. It is not a Corvette alternator. It is a NAPA generic remanufactured 10DN, model 13-4013 used for cars with A/C (according to their web site rated 55-63 amps). The reman sticker on the unit states "Computer tested, rated 63 amps." My current alternator is the original 37 amp with the "right" numbers and I will keep that.
I purchased the reman in anticipation of adding a stereo amplifier to my 1967 in the spring and possibly Vintage Air A/C. But it was clocked wrong and despite being very careful I broke the corner off the brush holder!! So I purchased the Standard RX-99A brush and holder replacement. It was a duplicate of the original and fit right in very nicely. Afterwards on-line I noted that RX-99A is pretty universal for GM cars of that era with the exception of 63-amp alternators? That was the genesis of my question. In retrospect the reman amp rating may not be accurate or related to the size and shape of the brush holder. After all it did fit. So I think things are OK. I will find out in April. I am assuming of course that the original wiring and voltage regulator can handle those amps. But if 1967s with A/C came with 61-amp alternators I am sure it can.
Thanks again.Comment
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Re: Try this another way
Paul,
At such time as you install an A/C I suggest you power it through a relay with a separate heavy wire direct to the battery terminal on the voltage regulator with appropriate fuse in line. You can actuate the relay through the stock wiring. If you install an electric fan, run it through another relay.
This will help keep from overloading the stock wiring. You may need to run a heavier wire from the alternator output to the voltage regulator.
I don't know if your voltage regulator will handle the increased load, maybe someone else can answer that question.
VerleComment
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Re: Try this another way
Paul-----
The NAPA 13-4013 is a series 10 DN alternator and utilizes the brush/holder set I previously described.
Alternators will often "test out" at somewhat varying amperage outputs, even though they have the same "guts". In this case, I'm quite sure that the rating is "tested output" rather than the "fundamental" rating for a certain configuration of parts. As I mentioned, I believe that the "62-65 amp" ratings in the application literature refers to a different series alternator. A series 10 DN has a "fundamental" rating of 61 amps, maximum; however, specific units may "test out" higher than that. In fact, I believe that 10DN (or 10SI, for that matter) that have ratings of 55 amp or 61 amp represents the approximate TESTED output of a particular alternator. The "internals" for a 55 amp and 61 amp are exactly the same.
By the same token, 37, 43, or 45 amp alternators differ only by their measured, actual output. The internals for all three of the alternators are exactly the same.In Appreciation of John HinckleyComment
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Re: Try this another way
Thanks Joe. I will have NAPA test it tomorrow following my brush and holder swap.
Verle has me thinking about the Vintage or Hot Rod Air A/C install. Seems there's more than meets the eye. Their web sites make things look rather simple. Probably not and more fuss and expense than it's worth for 4 weeks of extreme summer heat (86 to 90F) here in Canada.Comment
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Re: Try this another way
Joe's dead nuts on about there being unit-to-unit variance due to internal component tolerance/efficiency. You'll also see current output vary with heat loading and RPM. Most of the in-store testers are simply 'go/no-do' boxes that rev the alternators to a fixed RPM for a short test period and don't profile them across their RPM band allowing them to heat soak over time...Comment
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Re: Try this another way
That alternator tested at a local AC Delco shop this morning at 55 amps. I do not know at what rpm. As noted above that will vary in real world conditions. But it is close to what was advertised and the replacement Standard brush holder is working just fine. So I will install it come spring.Comment
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Current Alternator Pic
My current 37-amp alternator is dated January 25, 1967 for a February 10 build date. So that looks OK in terms of numbers and it a keeper.
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Re: Try this another way
Paul,
The relays will protect your stock wiring harness by bypassing the heavy load. The relays are not hard, nor should they be expensive, to install. Don't let that be a deciding factor.
"extreme summer heat(86 to 90F)"
That is a mild spring day in Oklahoma.
VerleComment
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Re: Try this another way
Verle,
I'll check into the relay matter. I have an acquaintance at a GM dealer who is an electrical whiz. On temps, during the summer of 2005 we did not have one day when the temperature exceeded 86F (30C). Last summer was somewhat warmer but not much. Hence my navel-gazing on putting money into an aftermarket A/C.Comment
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