Tired of researching... alternator wiring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rogue_Alphonse · 08-20-2012, 08:58 PM

It's probably been asked a billion times but I can't seem to get anywhere. I'm doing a serpentine belt swap on my '88 Blazer with a 5.7, and it came with V-belts and the two-prong plug alternator, with a small ribbed belt for that. I plan to convert to the four-prong one that came with the serpentine setup [actually original to the 1990 engine, but not the truck so when I did the swap I kept the V-belt BS].

The truck is an original 5.7 TBI with A/C and has all gauges on the dash. It came original with V-belts, the ribbed belt for the alternator, and a smog pump which is now gone although I will be putting A/C back in it while I'm doing this belt conversion.

Just looking for the simplest way to make the wiring work!

Ronaldo · 08-21-2012, 12:48 AM

http://www.qualitydist.net/pico-5327pt.html

Right here, click the link....
I found it in the electrical forum..
Ron

manimal · 08-21-2012, 08:56 AM

You can also check at MADelectrical. You will find the diagrams you need.

**hatzie** · 08-21-2012, 12:53 PM

The stock unit is a Delco SI. The 1990 unit should be a Delco CS.
http://www.chevelles.com/techref/tecref14.html
Google SI to CS conversion for lots more.

gchemist · 08-21-2012, 01:52 PM

Ditch the CS alternators. Upgrade to the CS130 or CS144.
IDs: http://www.rowand.net/Shop/Tech/GmAl...tification.htm

Check out this monster on my truck.

145 amps!! It's out of '08 truck. Power options work great. Plenty of power for dual electric amps and stereo.

Two wire connection make it work. One large wire, I mean AWG type to the battery. Another small wire to fusiable link connector on the fire wall. To power the alternator, I use an ignition power source from the fuse box. From the power source, the wire is connected to a light switch. The switch to the alternator. When the light is on, power is not but the alternator is not charging. The light will stay on at start up or until the alternator starts to charge. When light goes off, the alternator is charging. If I lose the belt or something goes wrong, I know because the light goes on. The alternator connection only needs power to the "L" connection. The wiring is simple and works great. Incase of a problem, I know where to look too.

Rogue_Alphonse · 08-21-2012, 06:11 PM

I did read a little about the newer ones, my problem is I have two CS alt's, one being a brand new junkyard find. [my last two TBI trucks had two alternators, and in fact I still have that wiring harness as well]

gchemist · 08-22-2012, 07:32 AM

Oh, okay. Use the wiring diagram for a diesel truck!!

08-20-2012, 08:58 PM	#1
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	Tired of researching... alternator wiring It's probably been asked a billion times but I can't seem to get anywhere. I'm doing a serpentine belt swap on my '88 Blazer with a 5.7, and it came with V-belts and the two-prong plug alternator, with a small ribbed belt for that. I plan to convert to the four-prong one that came with the serpentine setup [actually original to the 1990 engine, but not the truck so when I did the swap I kept the V-belt BS]. The truck is an original 5.7 TBI with A/C and has all gauges on the dash. It came original with V-belts, the ribbed belt for the alternator, and a smog pump which is now gone although I will be putting A/C back in it while I'm doing this belt conversion. Just looking for the simplest way to make the wiring work! __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!

08-21-2012, 12:48 AM	#2
Ronaldo Registered User Join Date: Jul 2012 Location: Pinetop,AZ Posts: 32	Re: Tired of researching... alternator wiring http://www.qualitydist.net/pico-5327pt.html Right here, click the link.... I found it in the electrical forum.. Ron

08-21-2012, 08:56 AM	#3
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Tired of researching... alternator wiring You can also check at MADelectrical. You will find the diagrams you need. __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

08-21-2012, 12:53 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Tired of researching... alternator wiring The stock unit is a Delco SI. The 1990 unit should be a Delco CS. http://www.chevelles.com/techref/tecref14.html Google SI to CS conversion for lots more. __________________ 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.

08-21-2012, 01:52 PM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Tired of researching... alternator wiring Ditch the CS alternators. Upgrade to the CS130 or CS144. IDs: http://www.rowand.net/Shop/Tech/GmAl...tification.htm Check out this monster on my truck. 145 amps!! It's out of '08 truck. Power options work great. Plenty of power for dual electric amps and stereo. Two wire connection make it work. One large wire, I mean AWG type to the battery. Another small wire to fusiable link connector on the fire wall. To power the alternator, I use an ignition power source from the fuse box. From the power source, the wire is connected to a light switch. The switch to the alternator. When the light is on, power is not but the alternator is not charging. The light will stay on at start up or until the alternator starts to charge. When light goes off, the alternator is charging. If I lose the belt or something goes wrong, I know because the light goes on. The alternator connection only needs power to the "L" connection. The wiring is simple and works great. Incase of a problem, I know where to look too. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-21-2012, 06:11 PM	#6
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	Re: Tired of researching... alternator wiring I did read a little about the newer ones, my problem is I have two CS alt's, one being a brand new junkyard find. [my last two TBI trucks had two alternators, and in fact I still have that wiring harness as well] __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!

08-22-2012, 07:32 AM	#7
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Tired of researching... alternator wiring Oh, okay. Use the wiring diagram for a diesel truck!! __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

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