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04-11-2021, 05:37 PM | #1 |
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Alternator
What is the part number or car/truck year and model so I can purchase a internally regulated alternator. I tried using the part number shown in the stickie but parts stores tell me it’s back ordered indefinitely.
Also, what would be the best amp to choose for stock factory harness with A/C, electric fans, and aftermarket lights and radio. Just don’t want to burn truck up with too high an amp output. There is a possibility of going to dual batterie in the future. |
04-11-2021, 06:01 PM | #2 |
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Re: Alternator
i personally upgraded to the CS 130 , very easy to do and gives you all the juice you need , ill see if i can find the thread http://67-72chevytrucks.com/vboard/s...ator+upgrading , you will find in electrical board if link not work
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72 Chev Cheyenne Super SB 4x4 350,4spd,buckets, tilt,tach,am-fm,extreme tow hooks,Canadian Model Production 1 of 52 SOLD 70 Chev CST, 350 auto, PS, PB, AC, tach |
04-11-2021, 07:12 PM | #3 | |
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Re: Alternator
Quote:
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04-11-2021, 08:22 PM | #4 |
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Re: Alternator
I went through a similar situation a couple years ago, got lots of great help & advice here. The one I got did the trick and I'm very pleased with it. It's a 94A alternator for an '85 Buick Riviera, O'Reilly's p/n ULT R111785A.
https://www.oreillyauto.com/detail/c...-buick-riviera
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
04-11-2021, 08:59 PM | #5 |
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Re: Alternator
I currently use an ACDelco 63A 10 SI, P/N from Rock Auto, alt P/N 88864305, plug clock @ rear view 3 o'clock. $57.89 w/$25.00 core charge ($32.89).
It powers everything fine, but I have a mechanical fan and no high power draws like high wattage stereo gear. However, I have notes in my spreadsheet that if needed I can upgrade to 85A 15 SI, ACDelco 334-2128 {#19135686, 88863357} or 78A 12 SI, ACDelco 334-2156A or 335-1094, 3 o'clock.
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1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column. |
04-11-2021, 10:48 PM | #6 |
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Re: Alternator
I just did this conversion, I went with a 10si. I ordered an alt for a '79 Monte Carlo with A/C.
Here's a link to that thread:http://67-72chevytrucks.com/vboard/s...d.php?t=820083 A 12si alternator wires in exactly the same. A CS series alternator hooks up almost the same, except you have to install a resistor. Probably way more helpful than my thread; here's a link to the Faq by VetteVet: http://67-72chevytrucks.com/vboard/s...d.php?t=815300
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Insert clever text here: Last edited by Greasey Harley; 04-12-2021 at 09:47 AM. |
04-12-2021, 09:44 AM | #7 |
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Re: Alternator
I would do a couple of things in your situation. I would get rid of the factory ammeter and go to a voltmeter. I would change to a CS144 (I would not use a CS130 as a paperweight). Delco #8077 pigtail is used if you have a lamp on the dash and the #8078 has a load resistor for use with no lamp to go from SI wiring to CS so you will have to do some adapting(different plug at alternator, but can use the same sense wires). Application for a 140A CS144 is '95 Buick Roadmaster. Then I would add a bigger wire from the alternator output to the battery. I might also add a junction block near the battery to power the fans and amp, that way you don't add any high loads to the original harness. While I was wiring, I would add headlight relays as well (to get brighter headlights and take load off the original switches and wiring).
If you don't want a CS144, then a 12si in either 78A or 94A. Anything bigger may have cooling issues. The 84-85 Corvettes do have a 12si that is 120A, but I would go CS144 if I wanted over 100A. 94A 12si is Delco 321-269 application '85 Riviera with 305Y, HD cooling and a/c. 78A 12si is Delco 321-244 application '85 Cutlass Supreme with 305Y. Nothing wrong with a 10si, I would just get a 12si if I was making the change since they have improvements. Don't use a 10si fan on a 12si, you have to get the 12si fan so be sure what you buy has the fan on it.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
04-12-2021, 10:07 AM | #8 | |
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Re: Alternator
Quote:
Also, my alternator is mounted on the Driver Side. |
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04-12-2021, 10:35 AM | #9 | |
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Re: Alternator
Quote:
On a 10si/12si alternator they are easy to re-clock. The alternator p/ns I gave are for 9:00 which should point the connector at the driver side.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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04-29-2021, 04:43 PM | #10 | |
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Re: Alternator
Quote:
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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04-12-2021, 10:43 PM | #11 | |
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Re: Alternator
Quote:
https://67-72chevytrucks.com/vboard/...698377&page=19
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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04-13-2021, 06:02 AM | #12 |
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Re: Alternator
So after looking at the mounting bracket that is on the truck I am not sure a CS will fit. is the Bolt pattern / spacing the same for the SI as what I currently have installed?
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04-13-2021, 09:54 AM | #13 |
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Re: Alternator
Looks like you have a long water pump and later accessories with aftermarket upper alternator bracket? You may have to modify the upper bracket, but the bottom would bolt right in. When I did mine (in an '83, so RH side) I used mid-80s style crank and water pump pulleys that had a serpentine style for just the alternator, it has v-belts for a/c and p/s.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
04-13-2021, 10:04 AM | #14 |
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Re: Alternator
This was all on the truck when I purchased it. Does the 10SI or 12SI have the same bolt pattern as the 10DN that I currently have installed. or will they require modifications as well?
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04-13-2021, 12:28 PM | #15 |
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Re: Alternator
10si, 12si, and 10dn are all dimensionally the same as far as mounting.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
04-18-2021, 07:16 PM | #16 |
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Re: Alternator
All Alternators drop off at lower rpm. If it's holding close to 13.0 at idle with AC and lights on, you'll be fine.
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'67 GMC 2500, 292, 4spd, AC |
04-18-2021, 07:34 PM | #17 |
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Re: Alternator
OK, at the battery. Were the lights and AC on?
The 13.5V is no load except the ignition- it has to be running, of course.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
04-18-2021, 08:55 PM | #18 |
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Re: Alternator
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04-18-2021, 10:17 PM | #19 |
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Re: Alternator
OK, if the battery stays charged I guess it's alright. I just remember from my mechanic days that 13.5V was the minimum to charge a battery on vehicles.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
04-19-2021, 09:08 AM | #20 |
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Re: Alternator
That number will change a little with ideal speed. If it is real slow. I didn't know that alternators had a use by date. LOL.
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04-19-2021, 01:54 PM | #21 |
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Re: Alternator
>>"flash the field"<<
An interesting term to use when you are talking about an AC Alternator. If we were talking about a DC Generator that term would make more sense. When discussing a DC Generator, someone will always mention Polarizing the Generator. In the first image below there are Iron Pole Pieces used in DC generators, The Field Windings are wrapped around these Pole Pieces. These Iron Pole Pieces retain a great deal of magnetism. The Polarity of the magnetism retained in these pole pieces is crucial to the correct operation of a DC Generator. When working on a DC Generator, it is common for the polarity of the residual magnetism to be reversed. It is then very important to correctly align the magnetic polarity of the pole pieces, with the Polarization procedure. AC Alternators do retain some residual magnetism, but the polarity is not an issue. In the second image, the ignition switch connects 12V from the battery, through the voltage regulator, directly to the field winding. Full Field magnetism is generated and current begins to flow in the Stator Windings. This ignition circuit is called a Exciter Circuit. Full Field magnetism is generated the moment the key is turned ON and also at idle. Field magnetism is reduced by the voltage regulator, as max voltage is reached.
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'67 GMC 2500, 292, 4spd, AC |
04-19-2021, 02:20 PM | #22 |
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Re: Alternator
>>The theory behind this is a perfect wire with perfect connections will not drop voltage so the meter will read zero volts.<<
All copper wire has resistance to electrical flow. The fatter the wire, the less resistance, the lower the voltage drop from one-end-to-the-other. Chevy relies on that voltage drop on the wire between the Alt and the Battery. That is the basis of the design of the Ammeter circuit. The greater the Alternator output, the greater the Voltage Drop on that wire, the greater the Ammeter indication. The type of Ammeter used in these trucks must have an External SHUNT. In this case the Charging wire serves doubly duty and is also the Shunt Wire for the Ammeter. Other Ammeters contain an Internal Shunt. This '67-72 Chevy Ammeter does not.
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'67 GMC 2500, 292, 4spd, AC |
04-20-2021, 11:07 PM | #23 | |
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Re: Alternator
Quote:
What would you expect the voltage drop on the Shunt wire to be on a stock system at idle with all the switchable loads turned off (i.e. wipers or headlights)? Hopefully the OP will be able get things back to normal.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 04-20-2021 at 11:34 PM. Reason: -4 Grammer |
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04-21-2021, 08:08 AM | #24 |
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Re: Alternator
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04-21-2021, 08:58 AM | #25 |
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Re: Alternator
That is good to hear. Congradulations!
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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