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01-20-2022, 08:27 PM
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#1 |
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Registered User
 Join Date: Nov 2020
Location: Licking, Missouri
Posts: 17
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LS harness
Hello,
I bought a a harness from Coolmike. He is using pin L on alternator for ecm. The same pin with resistor to run my factory amp gauge. He said cant split off that wire to run factory gauge is not 12v. Any ideas Thanks Ken
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1990 Toyota 4Runner Mercedes swap 2004 Chrysler Crossfire (Saved from 6 years in weeds) 2004 Chevy Silverado (CA truck no rust) 2000 Dodge Intrepid 400,000 Miles 1969 Chevy C30 work in progress (Saved from pasture) |
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01-24-2022, 11:44 AM
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#2 | |
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BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,255
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Re: LS harness
Quote:
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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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01-27-2022, 01:35 AM
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#3 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: LS harness
Do you have a four pin alternator or just the one wire to "L" ? I believe the ECM controls the exciter voltage to "L" but it uses less than than 12 volts and it is switched to ground. You should be able to control the alternator but don't add anything to the "L" or you will probably fry the ECM.
If your ammeter gauge wiring is in place you shouldn't need to connect anything off the alternator for it to work. You should have 2 wires in the harness with 2 small inline fuses (4 amp) in each wire. One over near the battery and one on the main junction of the alternator output wire and the battery, and cab wires. These two wires, one black and one black with white stripe, run into the cab to the cluster plug to terminals 1 and 12. I have a FAQ thread in the electrical forum with more info on the ammeter also called the battery gauge. If You have an alternator with the four terminals labeled " P L I S " or " F S L P " Then you should be able to control the alternator without the ECM. You would need to run a wire from the key switch accessory terminal with an 85 ohm 5 watt resistor inline to the "L" terminal and one from the main junction to the "S" terminal for voltage sensing. There should be several wiring diagrams in the FAQ thread to illustrate what I have said.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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