alternatot wiring question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

themb2g · 06-01-2013, 03:06 PM

I have put a single wire alternator into the truck and now I'm wondering how to wire the gauge wire in. I have the ground to the engine block and the positive lead to the starter. How do I get the signal to the gauge cluster.

themb2g · 06-01-2013, 03:10 PM

Here is where the wire comes out of the fuse block.

themb2g · 06-01-2013, 03:12 PM

Here is the alternator with the ground and positive wires shown.

jaros44sr · 06-02-2013, 08:54 AM

When ever i have an electrcal issue, i post it up in the electrical section. Guys down there really know their stuff. Give it a try, cant hurt

*70-K5* · 06-11-2013, 06:29 PM

I would put a three wire back in it, but that's just my opinion after reading some tech articles regarding the topic at http://www.madelectrical.com/

Are you trying to wire in a volt or amp gauge?

You're volt gauge can be run anywhere you want it to go, the alternator, fuse block, starter post.. Amp gauge you don't really need anymore.

Jagermeister · 06-12-2013, 01:00 PM

If you are refefring to the generator warning light in the cluster, the installation instructions for the Painless wiring harness say that you CANNOT use the warning light with a one-wire alternator. I would image that applies to the stock harness as well.

If you referring to the battery gauge, I think that would work just the same. You can probably find a more complete answer by checking some of the other threads here. For example, I found this snippet:

"There are two ammeter wires (one black wire and one black/white stripe wire) running from the harness on the firewall to a junction by the drivers headlight. The wires are labeled, in the wiring diagram in the service manual, as Ammeter Generator and Ammeter Battery."

As long as the "Ammeter Generator" generator wire is conencted to the output of the alternator the ammeter should continue to work as before. But as I said, searching the forum will probably get you a more complete answer.

06-01-2013, 03:06 PM	#1
themb2g Registered User Join Date: Jul 2010 Location: Portland, Oregon Posts: 411	alternatot wiring question I have put a single wire alternator into the truck and now I'm wondering how to wire the gauge wire in. I have the ground to the engine block and the positive lead to the starter. How do I get the signal to the gauge cluster. __________________ Check out my build: 1972 LQ4 Swap http://67-72chevytrucks.com/vboard/s...=1#post5427693 Last edited by themb2g; 06-02-2013 at 12:20 AM.

06-01-2013, 03:10 PM	#2
themb2g Registered User Join Date: Jul 2010 Location: Portland, Oregon Posts: 411	Re: alternatot wiring question Here is where the wire comes out of the fuse block. __________________ Check out my build: 1972 LQ4 Swap http://67-72chevytrucks.com/vboard/s...=1#post5427693

06-01-2013, 03:12 PM	#3
themb2g Registered User Join Date: Jul 2010 Location: Portland, Oregon Posts: 411	Re: alternatot wiring question Here is the alternator with the ground and positive wires shown. __________________ Check out my build: 1972 LQ4 Swap http://67-72chevytrucks.com/vboard/s...=1#post5427693

06-02-2013, 08:54 AM	#4
jaros44sr Registered User Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,446	Re: alternatot wiring question When ever i have an electrcal issue, i post it up in the electrical section. Guys down there really know their stuff. Give it a try, cant hurt __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

06-11-2013, 06:29 PM	#5
70-K5 Account Suspended Join Date: May 2013 Location: West Linn Posts: 163	Re: alternatot wiring question I would put a three wire back in it, but that's just my opinion after reading some tech articles regarding the topic at http://www.madelectrical.com/ Are you trying to wire in a volt or amp gauge? You're volt gauge can be run anywhere you want it to go, the alternator, fuse block, starter post.. Amp gauge you don't really need anymore.

06-12-2013, 01:00 PM	#6
Jagermeister Registered User Join Date: Jun 2009 Location: Glen Ellen, CA Posts: 15	Re: alternatot wiring question If you are refefring to the generator warning light in the cluster, the installation instructions for the Painless wiring harness say that you CANNOT use the warning light with a one-wire alternator. I would image that applies to the stock harness as well. If you referring to the battery gauge, I think that would work just the same. You can probably find a more complete answer by checking some of the other threads here. For example, I found this snippet: "There are two ammeter wires (one black wire and one black/white stripe wire) running from the harness on the firewall to a junction by the drivers headlight. The wires are labeled, in the wiring diagram in the service manual, as Ammeter Generator and Ammeter Battery." As long as the "Ammeter Generator" generator wire is conencted to the output of the alternator the ammeter should continue to work as before. But as I said, searching the forum will probably get you a more complete answer.



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