Changed heater core, now no start

[944matt]

okay, so this jeep had a viper alarm on it, has been removed for a while. there was 3 wires tapped on the ign circuit

i jumped the fat pink wire to the pink/green wire and all the issues went away except for no crank issue. so I'm thinking the wiring is messed up somewhere in there but I'm still lost as to where to start. is it possible the ignition switch could of went bad? I'm not a believer in coincidences

 

[lafittejeep]

I wasnt brave enough to change my heater core so I just bypassed. Dont really need the heater in South Louisiana. Good luck though

 

[944matt]

I wasnt brave enough to change my heater core so I just bypassed. Dont really need the heater in South Louisiana. Good luck though

Starting to wish I never touched this one it’s kicking my ass.

On the fsm I believe I narrowed my issue down to 8w-11-9 but I’m not sure really how to read schematics. So I’m still running around this thing like a chicken with my head cut off

 

[AjRagno]

The rear defrost switch and instrument cluster grounds are G200 & G201. The manual doesn't show the exact location but it's below the driver side speaker:

View attachment 178669

 

[944matt]

The rear defrost switch and instrument cluster grounds are G200 & G201. The manual doesn't show the exact location but it's below the driver side speaker:

View attachment 178669

I saw those when I removed the dash, I cleaned them and no luck

 

[944matt]

I’m pretty sure this doesn’t go to anything to my specific Jeep, but sanity check anyone?

 

[AjRagno]

I’m pretty sure this doesn’t go to anything to my specific Jeep, but sanity check anyone?

View attachment 178832

View attachment 178833

Simplest way to figure out what that connector is for is to search the wire colors in the service manual. If that is DG/WT & PK/YL, it's the brake transmission interlock, which would not connect to anything in your case.

You sure you didn’t touch any if the ground wires in the engine bay? The PCM grounds to the stud on the passenger side of the engine block. There is also a black body ground on the passenger side of the tub and another from the driver side of the head to the tub, I believe this is the ground that supports everything behind the dash.

 

[944matt]

I fixed it but I’m not 100% sure what the fix was, I took everything apart again, for like the 4th time and noticed that the black connector to where the engine harness connects to the dash harness was a little hard to clip in, upon further investigating The blue tray that locks the pins in was lifted a little, I reseated it.


Also I found about 3 wires with a little bit of insulation missing and I cut, spliced and heat shrink them.


There is also a lot of bad wiring that I removed, like the cirrus radio and kenwood box, the viper alarm that was ghetto rigged in there and a lot of other ghetto wiring the Jeep has in it, I removed all of that.


I then went into the PDC and checked all the wires for loose connections, same with the back of the fuse box inside the Jeep.


Thanks everyone for your help, now all I have to do is learn how to read a wiring schematic. I mostly work on Porsche, BMW and Japanese cars I didn’t expect a Mopar to kick my butt so hard. But I’ve restored faith in myself being able to drive this thing down the road