How to swap old Alternator to this new one - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

5150 · 07-07-2006, 03:55 PM

got it wired up today and it's running great. Didn't know if I had the idiot light or if I needed the resistor. Checked to make sure there was a bulb in the socket and started her up.

Volt Gauge said it was at 12 volts, plugged the alt in and the idle went up and it went to 14 gauge.

Thanks to all you guys that helped and to Tug for the ttt!!!!

neonlarry · 07-07-2006, 04:18 PM

If you have a gauge you NEED a resistor our you risk blowing out the diode in the alt (its not made to take a full 12V). Also you need a much heavier gauge wire run from the alt output post (which is seperate from the plug) to the battery than the wiring in the truck.
You are trying to insist on hooking up to stock wiring and thats not the way to go. I explained how to wire it in PM before but suit yourself.

5150 · 07-07-2006, 04:24 PM

I have a light, not a gauge

I have an aftermarket gauge that I put it, that's what I was reading the volts off of.

07-07-2006, 03:55 PM	#26
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: How to swap old Alternator to this new one got it wired up today and it's running great. Didn't know if I had the idiot light or if I needed the resistor. Checked to make sure there was a bulb in the socket and started her up. Volt Gauge said it was at 12 volts, plugged the alt in and the idle went up and it went to 14 gauge. Thanks to all you guys that helped and to Tug for the ttt!!!! __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

07-07-2006, 04:18 PM	#27
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Re: How to swap old Alternator to this new one If you have a gauge you NEED a resistor our you risk blowing out the diode in the alt (its not made to take a full 12V). Also you need a much heavier gauge wire run from the alt output post (which is seperate from the plug) to the battery than the wiring in the truck. You are trying to insist on hooking up to stock wiring and thats not the way to go. I explained how to wire it in PM before but suit yourself. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

07-07-2006, 04:24 PM	#28
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: How to swap old Alternator to this new one I have a light, not a gauge I have an aftermarket gauge that I put it, that's what I was reading the volts off of. __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4



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