alternator wiring help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Paul83 · 10-30-2014, 08:29 PM

I know this has been asked before. the more research I do the more confused I am. I have just installed a serpentine system on my truck. it came out of a 1992 k 5 blazer. I hav kept the plug from the alternator that goes on the top from the old harness. This plug has only 1 wire. the plug from my harness has two. which one of those wires can I cut and use with the other plug. Thanks for any help.

*gmachinz* · 10-30-2014, 10:27 PM

The newer style plug has only a 12V IGN switched source so you need to use the white wire from your existing harness. You'll need to do one of two things too-run a HD (6ga or larger) to the battery from the charge post, then from the battery to your common 12V power junction or; run that same gauge wire from the alternator post to the common 12V junction then to the battery.
Re-route your existing red alt. plug lead to your common 12V common power junction.

And as for that 12V switched IGN wire lead, you need to add at least a 10-ohm resistor in series. I think there may be an adapter harness pigtail but I would suggest using your stock wire-its better quality than the parts store crap pigtail wiring. The resistor you can find at Radio Shack.

Paul83 · 10-30-2014, 11:06 PM

Is the wire from the newer alternator just an exciter wire then?

bL.A.zer90045 · 10-30-2014, 11:13 PM

i always use a pigtail/adapter from napa for my serp set-up conversions in my g-bodies. it plugs into the old 2 prong style alt connector on one en and adapts to the newer 3 prong alt conector. napa part# ec82.they are 20.00.

*gmachinz* · 10-30-2014, 11:15 PM

Yes, since CS alternators for the most part went to remote voltage sensing @ a remote 12V junction so there is no need for a red lead to the alternator plug-in.

**hatzie** · 10-31-2014, 11:49 AM

The long version...
http://www.pirate4x4.com/tech/billavista/Wiring/Part2/

AC Delco makes two different adapter pigtails to go from AC Delco 10SI & 12SI to CS130 & CS144

Non-resistor adapters for warning lamp instrument clusters;
- AC Delco: 8077
- Haywire: 2110
- Painless Wiring: 30707

Resistor adapters (35-45Ω resistor in sense wire) for gauge clusters:
- AC Delco: 8078

These guys make an AC Delco 10SI & 12SI to CS130D & AD230 & AD237 & AD244 alternator.
PN W1203 has no resistor... I am not sure whether the Advance Design alternators need a resistance in the sense wire. The CS series will not last more than a few months without it.
http://www.qualitypowerauto.com/item...-Harnesses.htm

Just call me Sean · 10-31-2014, 03:23 PM

Pink/black goes to brown.

First pic '92 second pic '77-'87. Both run through the charge light it's just on a different diagram for the '92.

Paul83 · 11-02-2014, 08:08 PM

Thank you for all the help. I have got it done. Not very difficult or time consuming.

10-30-2014, 08:29 PM	#1
Paul83 Registered User Join Date: Dec 2012 Location: Humble, TX Posts: 171	alternator wiring help I know this has been asked before. the more research I do the more confused I am. I have just installed a serpentine system on my truck. it came out of a 1992 k 5 blazer. I hav kept the plug from the alternator that goes on the top from the old harness. This plug has only 1 wire. the plug from my harness has two. which one of those wires can I cut and use with the other plug. Thanks for any help. __________________ I don't care how old or gangster you think you are; if a 3 year old hands you a play phone you answer that! I like long walks on the beach, dinner by candle light, and poking dead things with a stick.

10-30-2014, 10:27 PM	#2
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: alternator wiring help The newer style plug has only a 12V IGN switched source so you need to use the white wire from your existing harness. You'll need to do one of two things too-run a HD (6ga or larger) to the battery from the charge post, then from the battery to your common 12V power junction or; run that same gauge wire from the alternator post to the common 12V junction then to the battery. Re-route your existing red alt. plug lead to your common 12V common power junction. And as for that 12V switched IGN wire lead, you need to add at least a 10-ohm resistor in series. I think there may be an adapter harness pigtail but I would suggest using your stock wire-its better quality than the parts store crap pigtail wiring. The resistor you can find at Radio Shack.

10-30-2014, 11:06 PM	#3
Paul83 Registered User Join Date: Dec 2012 Location: Humble, TX Posts: 171	Re: alternator wiring help Is the wire from the newer alternator just an exciter wire then? __________________ I don't care how old or gangster you think you are; if a 3 year old hands you a play phone you answer that! I like long walks on the beach, dinner by candle light, and poking dead things with a stick.

10-30-2014, 11:13 PM	#4
bL.A.zer90045 Registered User Join Date: May 2012 Location: 90045 cali Posts: 565	Re: alternator wiring help i always use a pigtail/adapter from napa for my serp set-up conversions in my g-bodies. it plugs into the old 2 prong style alt connector on one en and adapts to the newer 3 prong alt conector. napa part# ec82.they are 20.00.

10-30-2014, 11:15 PM	#5
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: alternator wiring help Yes, since CS alternators for the most part went to remote voltage sensing @ a remote 12V junction so there is no need for a red lead to the alternator plug-in.

10-31-2014, 11:49 AM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,930	Re: alternator wiring help The long version... http://www.pirate4x4.com/tech/billavista/Wiring/Part2/ AC Delco makes two different adapter pigtails to go from AC Delco 10SI & 12SI to CS130 & CS144 Non-resistor adapters for warning lamp instrument clusters; - AC Delco: 8077 - Haywire: 2110 - Painless Wiring: 30707 Resistor adapters (35-45Ω resistor in sense wire) for gauge clusters: - AC Delco: 8078 These guys make an AC Delco 10SI & 12SI to CS130D & AD230 & AD237 & AD244 alternator. PN W1203 has no resistor... I am not sure whether the Advance Design alternators need a resistance in the sense wire. The CS series will not last more than a few months without it. http://www.qualitypowerauto.com/item...-Harnesses.htm __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 10-31-2014 at 11:56 AM.

11-02-2014, 08:08 PM	#8
Paul83 Registered User Join Date: Dec 2012 Location: Humble, TX Posts: 171	Re: alternator wiring help Thank you for all the help. I have got it done. Not very difficult or time consuming. __________________ I don't care how old or gangster you think you are; if a 3 year old hands you a play phone you answer that! I like long walks on the beach, dinner by candle light, and poking dead things with a stick.



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