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Gm 3800 v6 wiring help

Old 01-16-2019, 06:23 AM
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Does anyone know how many amps the engine draws minus the starter eg ecu, sensors, bcm injectors cuz I wanna fit a large relay to turn it on and off
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Old 01-16-2019, 11:55 AM
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Originally Posted by Paddymoss View Post
Does anyone know how many amps the engine draws minus the starter eg ecu, sensors, bcm injectors cuz I wanna fit a large relay to turn it on and off
What exactly are you trying to add a relay to? What circuit?
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Old 01-16-2019, 02:19 PM
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I'm using the rx8 ecu for the electronic power steering, abs and lights and cab stuff, ones I've put the key in and turned to power irl find a live feed that will switch the relay on to power the gm ecu and all engine functions
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Old 01-16-2019, 04:00 PM
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What ever you are powering through the relay you just need to add up each circuits current load to determine what amp relay to use.
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Old 01-16-2019, 11:53 PM
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Yes that'* wat I'm asking I need the information
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Old 01-17-2019, 05:44 PM
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Originally Posted by Paddymoss View Post
Does anyone know how many amps the engine draws minus the starter eg ecu, sensors, bcm injectors cuz I wanna fit a large relay to turn it on and off
I'd suggest looking at a fuse block diagram for the donor car. Take the current ratings for the fuses of each circuit that you want to include and add them up.
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Old 01-18-2019, 10:32 AM
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That'* a huge load for a single relay. You will have to divide the load across 2 or more relays.
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Old 01-19-2019, 01:01 PM
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OK that'* no problem I have bought a 200a relay, pluss a 170a and lots of 40a should be able to spread load evenly does anyone know of free flashing or remapping software I can get pluss the leads to rewrite ecu
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Old 01-19-2019, 06:52 PM
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No such thing as free software. You will need HPTuners to do what you want. $500. There is no work around with this. Period. I wouldn't trust EFIlive as far as I could throw it.

You would need to make your own OBD2 16 pin connector. You will only need 4 wires I believe. CAN high, CAN low, BATT, GRND.
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Old 01-19-2019, 07:10 PM
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Originally Posted by Paddymoss View Post
OK that'* no problem I have bought a 200a relay, pluss a 170a and lots of 40a should be able to spread load evenly does anyone know of free flashing or remapping software I can get pluss the leads to rewrite ecu
Free???? Let us know how that works.
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