bacressey

I知 trying to use the stock under hood fuse block on my LS1 jeep project, I知 also using a portion of the chassis harness.

I have 12v on the red pin on the ignition switch (c2), so I jump that to the yellow pin, which is Ignition crank output. I do this to simulate the key turning. However, nothing happens.

I think the problem lies in the relays in the fuse block. So my question is, what is need to happen to get the relays to close? I think the start relay needs some sort of voltage from something. I am not sure if it needs a signal from the park/neutral switch, or from the BCM. Does anyone have any suggestion to get around this problem?

bacressey

Suggestions? I find it hard to believe that nobody has a idea on what I should try.

RE AND CHERYL

iTrader: (31)

Did you disable VATTS in the PCM???

Re'

bacressey

Vatts is disabled, the problem seem to be in the start relay

Rick Speed

iTrader: (55)

Is this an auto or 6-speed

bacressey

Its a auto, I think I might need to check the neutral safety swith, does anyone know if there is a 12v signal coming out of the switch?

Camo_Soldier

im not really familiar with that kinda of stuff but ive got a feelin that there souldnt be power to it until in a gear....i may be wrong though so dont roast me on that

Rodder

iTrader: (2)

The basic wiring diagram for a Start circuit looks like this:

+12V -------- ignition switch -------- neutral safety switch -------- starter (or relay)

You'll have power on at least one side of the neutral safety switch when you turn the key to Start.

bacressey

So I got it all to work. This is how the starting circuit works with the ls1 chassis harness.

12v red on ignition switch -- when turn to start it connects to the yellow -- making the yellow wire hot -- yellow goes to start fuse -- on the otherside of fuse is a thin purple wire(which is hot when cranking) -- the purple wire goes to the park/ neutral switch -- when in park or neutral the circuit is connected an 12v is now present on the dark green wire -- that wire travels back to the under hood fuse block to the start relay -- then coming out of the relay is a yellow/black wire -- that goes to the BCM(I just jumped it to ground at the connector) So since the entire circuit is complete on relay's secondary side, the switch is closed sending voltage to the starter.

Think you guys for the help. Now I just need to get a park/neutral switch

Now onto the fuel relay