Wont start, wont turn over, blows fuse

[lilskyline240]

well i finally got around to gettin everything left on my rb25 s2 install done and it was time to start it. Turn the key and hear a pop and nothing. No starter turning. All i get is a click when i turn the key. All the dash lights work. Batt is charged. I go an check all my fuses and find my Engine control 10a fuse is blown. So i replaced it and tried to start it again and same thing. Just a click and a blown engine cont fuse...

anyone have a clue whats wrong?

[Joe]

you have a short.

check your wiring.

[lilskyline240]

well i got it to turn over now. starter ground wasnt on.

now i just need to find out what is makin the engine cont fuse blow the second the key is in the on position. Think is a bad ground? Anything specific i could check?

[Joe]

a bad ground will not blow a fuse

you have a power wire on that circuit shorting to ground.

[lilskyline240]

do you know whats all on that curcuit?

[Joe]

the ecu switched power i believe, someone correct me if im wrong.

[lilskyline240]

is that a wire at the ecu that runs right to that fuse?

[Joe]

just check your wiring near the ecu where it connects to your under dash wiring. i have a feeling something will be obvious.

[lilskyline240]

i didnt do the wiring on the car so im not sure if its right or not. It was pulled off a perfectly running rb25 in an s13 so it should be all done right. heres some pics of the wires that are just cut at ecu and not connected to anything. Also i have a plug that doesnt seem to hook up to anything that i think should be (the last picture)

[mott6904]

Man from your pictures it looks like you dont have the dash plug wired in and then there is a smaller group that look like it is touching ground. It might be the consult wiring which has power going to it. I would start there

[lilskyline240]

that brown plug looking thing does nothing. I have the large white dash plug connected. Its not in the picture. Im not sure what the brown plug looking thing is. That small group of wires are consult wires? if so ill make sure those arent grounding out

[mott6904]

that brown plug looking thing does nothing. I have the large white dash plug connected. Its not in the picture. Im not sure what the brown plug looking thing is. That small group of wires are consult wires? if so ill make sure those arent grounding out

The brown plug is just a ground junction. the white dash plug has the start wire in it. Im not sure but it looks like consult wire since there are only like 4 wires in it.

[lilskyline240]

alright thats something for me to start with tomorrow. I had those wires tucked behind the ecu so they prolly could have been grounding out.

Also does anyone know what the small white plug is for thats on the harness by the ecu? it looks like its supposed to go to something but i cant find anything around to plug it to

[lilskyline240]

well i separated all the wires for the consult and taped them off and the fuse still blows. So i checked my ecu wiring and i think i found something. The tach signal wire is spliced into another wire. not sure why. Ill try to get pics of that tomorrow.

[lilskyline240]

anyone else got imput?

[lilskyline240]

ok so i disconnected the ecu, and the white dash plug and pulled the whole upper harness into the engine bay. I taped off all the consult wires and then connected the battery and turned the key to the on position and the engine control 10a fuse STILL BLOWS!!! this is beginning to piss me off. Anyone know what is inline with that 10a fuse that is causing it to blow?

[Joe]

its very hard to diagnose a problem like this over the internet (see impossible) because its something you are going to have to find. here is a link to the S13 FSM. time to learn how to read a wiring diagram

http://www.240edge.com/manuals/s13-ka24e.html

who did your wiring harness?

[lilskyline240]

the harness was done by some wiring company. not sure who. both upper and lower harness came off a running rb25 s2 in a s13 chassis that had zero problems.

i think i might have foud something just by thinking today. I wonder if the short is even in the upper harness. because i had the ecu dissconnected and the upper harness disconnected from the dash harness and the fuse still blows. Tomorrow morn ima completely disconnect the upper harness and see if the fuse still blows. if it does, i know it has to be somewhere in my lower harness or interior. It has to be a huge short because the fuse EXPLODES when the key goes to the on position. you can see a fash of light from it. this leads me to believe im looking for something very obvious

[lilskyline240]

ok ive narrowed it down to when i unplug the large brown plug that connects the upper harness to the chassis on the front pass side of the engine bay the fuse doesnt blow. So now i just need to figure out what is on that circuit

[craz4240]

Listen to kamin and fault trace using the fsm,it's not very difficult just slightly time consuming...and theres reading involved too.

[lilskyline240]

idk how a s13fsm is going to help me when its my upper harness thats the problem from the RB. Ive been looking on racebread and the picture on there show only 1 wire that is used coming out of that brown plug by the battery tray. All of mine are still connected?

[lilskyline240]

well i believe i found the culprit. Its Pin 1 on the brown plug. a brown wire. After lookin at racebread, and all the wiring posts here, im pretty sure this wire isnt needed at all. not even sure what it goes to. But the second i touch the 2 wires together with the key in the on position the fuse blows. Can anyone verify that i actually do need this wire?

[DriftX]

It looks like that brown wire is for the power steering switch. All i can find in the s13 fsm is brn (brown) is p/s pressure.

Edit: After looking closer, Under "Engine Contol Wiring" in the s13 fsm, a brown wire is used for the winshield washer switch.

this brown wire controls your "wiper amp" . So perhaps your wiper motor is froze up, or your switch is on/stuck for wipers and pulling a hella lot of amps, blowing your fuse.

unhook your wiper motor and see what it does, although i don't think that's the problem.

Also using a brown wiring is the clutch inhibitor switch which is probably the cause of the fuse problem.

As judging by the diagram, brown is the hot side of the coil on the relay, on the other side is ground. So it is possible your inhibitor relay is welded closed.

Try swapping out your clutch inhibitor relay and let me know.

Brown wire is also used for power off the retract relay for your seatbelts, possibly you could unplug the power belts module under the center console.

That is all the brown wires used for the s13. Let me know what you find.


Modified by DriftX at 7:20 PM 4/8/2008

[lilskyline240]

my wipers work, my seat belts work.

im just gunna try to get this thing to work without that wire. I doubt is something i really need