Gen 4 ISS wiring question
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Teching In
Joined: Aug 2019
Posts: 35
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Gen 4 ISS wiring question Hi all,
Wiring up a 4l80e from a harness that was originally designed for a 6l80e. This has been quite a chore but I'm just about there. The question I have is for the ISS signal, do I run a wire off of my t42 harness to the front sensor and add a ground or does it just take 1 wire? I do have VSS high and low wires also, can I piggy back the low signal off of the VSS for the ISS?
thanks, Todd
Wiring up a 4l80e from a harness that was originally designed for a 6l80e. This has been quite a chore but I'm just about there. The question I have is for the ISS signal, do I run a wire off of my t42 harness to the front sensor and add a ground or does it just take 1 wire? I do have VSS high and low wires also, can I piggy back the low signal off of the VSS for the ISS?
thanks, Todd
TECH Junkie
Joined: Jun 2008
Posts: 3,202
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From: Nitro Alley
Hopefully you are using aftermarket wiring (the OEM harness is horrible at shielding speed sensor circuits).
Each speed sensor needs two wires.
The control module will have a terminal that acts as a shared sensor ground.
Each speed sensor will need to tie into this.
The second wire for each speed senor will have to be a dedicated input to the control module.
If you can get some shielded 2 conductor or 3 conductor wire from Holley EFI (or something similar) that would be ideal.
Each speed sensor needs two wires.
The control module will have a terminal that acts as a shared sensor ground.
Each speed sensor will need to tie into this.
The second wire for each speed senor will have to be a dedicated input to the control module.
If you can get some shielded 2 conductor or 3 conductor wire from Holley EFI (or something similar) that would be ideal.
