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Old 02-12-2007, 01:25 PM   #1
gundyfan
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serpentine belt system

I just in stalled a 1999 vortec and keep the serpentine belt system can anyone tell me how to wire up the alternator? I keep the plug that was attached to it when we where at the savage yard.The plug has one wire coming out of the plug.What do i hook it too.will it work with my factory gauge,If so how to wire this system?Thanks Jason
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Old 02-12-2007, 01:31 PM   #2
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Re: serpentine belt system

Should be a brown wire, correct?

You'll want to make sure that you only hook up to a wire from your system that ONLY supplies power when the key is in the run position.

Have you done the one wire alt conversion yet?
If not, check out the FAQ section, there's a great thread about it.
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Old 02-12-2007, 01:32 PM   #3
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Re: serpentine belt system

Also What Upper Radiator Hose Do You Use?
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Old 02-12-2007, 01:33 PM   #4
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Re: serpentine belt system

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Originally Posted by gundyfan View Post
Also What Upper Radiator Hose Do You Use?
Should be able to use an upper read hose from a 90ish truck, that's what's in mine and it fits really well. (not a vortec motor though)
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Old 02-12-2007, 01:35 PM   #5
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Re: serpentine belt system

I'll be watching this as I need to do mine also. I have the factor GM alternator (probably like you) not the one-wire type. I know there is two wires and that there is a resistor needed for the hookup, but I don't remember the detailes when I looked it up a while back.

As far as the hose, I am told if you use the inline six hose backwards it works pretty well and clears things. Like VT said a 90-95 hose should work too.
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Last edited by Palf70Step; 02-12-2007 at 01:37 PM.
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Old 02-12-2007, 01:50 PM   #6
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Re: serpentine belt system

My alt had three wires (90 version) but only the brown is needed.

The other two are not needed for our application.
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Old 02-12-2007, 01:56 PM   #7
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Re: serpentine belt system

VT, Is your's mounted in the back (6 banger or 4wd) position?
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Old 02-12-2007, 01:57 PM   #8
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Re: serpentine belt system

What Does The Brown Wire Hook To?need To See If Anyone Has The Color Of The Wire In The Harness To Hook To?and How Do I Hook It Up The My Original Gauge Will It Work?if So How Do I Hook Up The Gauge Thanks For Any Help
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Old 02-12-2007, 02:40 PM   #9
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Re: serpentine belt system

You should have three wires that went to your old alt.

Red - thick gauge wire that goes to the post on the back of the alt.
Yellow - will have constant 12v power - do not use.
Blue - has key power, hook this one to the brown of your newer style alt.

After you do the one wire alt conversion I spoke of in my first post.
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Old 02-12-2007, 03:23 PM   #10
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Re: serpentine belt system

So let me see if I understand this big red wire is coming from the battery goes on the post on the alternator and the blue wire is coming from the junction box on the fire wall and wired to the brown wire on the plug.will my gauge work is that what the blue wire is for.thanks vtblazer
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Old 02-12-2007, 03:34 PM   #11
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Re: serpentine belt system

Quote:
Originally Posted by gundyfan View Post
So let me see if I understand this big red wire is coming from the battery goes on the post on the alternator and the blue wire is coming from the junction box on the fire wall and wired to the brown wire on the plug.will my gauge work is that what the blue wire is for.thanks vtblazer
Blue wire should be coming from your converted voltage regulator.
The regulator is on the inside of the rad support on the drivers side, under the headlight assembly.

Yes, your Batt./charge gauge should work, mines does in this same configuration.
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Old 02-12-2007, 03:36 PM   #12
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Re: serpentine belt system

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Originally Posted by Palf70Step View Post
VT, Is your's mounted in the back (6 banger or 4wd) position?
No sure what your referring too, sorry.

My alt?
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Old 02-12-2007, 04:04 PM   #13
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Re: serpentine belt system

I bought this truck with no motor so nothing was hooked up,there is no volt regulator on the rad support it has been removed and wire had been cut and are hiding in side the wiring harness so i unwraped them and found so wire that why I'm wondering if the gauge will work with ou volt regulator.does your's have the volt regulator..
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Old 02-12-2007, 04:34 PM   #14
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Re: serpentine belt system

Quote:
Originally Posted by vtblazer View Post
No sure what your referring too, sorry.

My alt?
No...I am speakin in Monday Language (hosed up). I ment the engine position?
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Old 02-12-2007, 07:26 PM   #15
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Re: serpentine belt system

Quote:
Originally Posted by gundyfan View Post
I bought this truck with no motor so nothing was hooked up,there is no volt regulator on the rad support it has been removed and wire had been cut and are hiding in side the wiring harness so i unwraped them and found so wire that why I'm wondering if the gauge will work with ou volt regulator.does your's have the volt regulator..
Volt regular has been bypassed.

Check out the FAQ section, the thread is in there on how to do it.
Good thread, easy to do.

Your going to need to find out where the harness is hacked or missing and go from there.

Palf... I'm with ya now.
I believe it's in the 4x4 position, sits back pretty far.
When I was running the older HEI, coil in the cap it was touching the firewall for the most part.
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Old 02-12-2007, 08:39 PM   #16
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Re: serpentine belt system

Quote:
Originally Posted by vtblazer View Post
Volt regular has been bypassed.

Check out the FAQ section, the thread is in there on how to do it.
Good thread, easy to do.
Bypassing the VR is only for an internally regulated alt. Not the original external regulated alt. Correct?
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Old 02-13-2007, 08:29 AM   #17
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Re: serpentine belt system

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Originally Posted by 65-72 chevytoys View Post
Bypassing the VR is only for an internally regulated alt. Not the original external regulated alt. Correct?
Correct sir.

Super easy mod and you get better/higher charging capabilities at the same time.
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