Alt exciter wire? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big Port Jimmy 6 · 12-28-2010, 09:19 PM

I know that the PCM excites the Alt on my 5.3. What is going to make the light in the dash function? Will it come on and stay on since it is now disconnected? Jay

jkade · 01-12-2011, 06:07 PM

Quote:

Originally Posted by Big Port Jimmy 6

I know that the PCM excites the Alt on my 5.3. What is going to make the light in the dash function? Will it come on and stay on since it is now disconnected? Jay

it should not, basically you took away it's ground if it is not hooked up.... if I remember correct. I don't have the one in my blazer hooked up and it does not come on. Depending on what year model alt you have it should have 2 wires (if you are using a truck harness) and you can probably use the b pin to go to your - dash light pin. I am using a fbody harness and it has one wire but I am using a trk alt and the one wire went to pin B on the plug and then to the neg of the dash light. I had mine hooked up like that but the bulb shot and it was easier to install a light under the dash than pull the cluster back out.

87chevy.com · 01-16-2011, 11:34 PM

should be pin c. A friend bought a painless harness and was instructed to use the dash light or use a resistor from pin c and tap it into b to complete the circuit. Me, I was lazy and just ran the resistor. been that way for about 3 years.
clint

jkade · 01-17-2011, 03:23 PM

Quote:

Originally Posted by 87chevy.com

should be pin c. A friend bought a painless harness and was instructed to use the dash light or use a resistor from pin c and tap it into b to complete the circuit. Me, I was lazy and just ran the resistor. been that way for about 3 years.
clint

Mine is on pin B (98 camaro harness) but it might burn up the alt, we will see. That is the same way my 67 was to (98 harness/trk acc).

12-28-2010, 09:19 PM	#1
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Alt exciter wire? I know that the PCM excites the Alt on my 5.3. What is going to make the light in the dash function? Will it come on and stay on since it is now disconnected? Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

01-16-2011, 11:34 PM	#3
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: Alt exciter wire? should be pin c. A friend bought a painless harness and was instructed to use the dash light or use a resistor from pin c and tap it into b to complete the circuit. Me, I was lazy and just ran the resistor. been that way for about 3 years. clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

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