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Need help with wiring.

5K views 16 replies 6 participants last post by  The Ole Fart 
#1 ·
Long story short, I found out yesterday that "Betty Boop", (87 YJ), will start with the shifter in any position. She has a 4.2L engine with B&M turbo 350 trans. The shifter is a B&M truck megashifter. The shifter has 2 switches on the driver's side, one for back-up lights and one for neutral start. The neutral start has no wires going to it. How does it get wired up? Trying to get all the minor issues fixed so hopefully next sprin zI can install a 350.
Thanks for any help.
CD
 

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#2 ·
Was the YJ originally manual or auto? If manual, you won't have to wire it up. Swapping to a 350, like I'm working on, will get tied into the computer if going fuel injected. I'm doing throttle body injection with the 1227747 ecm and it gets tied into B10 on the computer harness. Carbureted 350, you wouldn't worry about it. You can still wire it up to only start in park/neutral with non computer controlled engines, you'd just wire it up as a kill switch so that the starter will only turn over in park/neutral.
 
#3 ·
Logic tells me that the signal wire from the ignition switch would run through the park switch. If the switch is not closed the power can't pass. I am not sure where you actually would tap in to the signal wire, but that shouldn't be too much of a problem. I believe the factory set up for an automatic is all inside the steering column since it would have been a column shifter. As C5 asked, if it was originally a manual things would be different. I think the switch for that would be under the clutch petal to ensure the clutch is depressed before starting.
 
#4 ·
I think the switch for that would be under the clutch petal to ensure the clutch is depressed before starting.
Early wranglers had no such switches.... Would make it much easier if they did because you could use the same circut but move those wires to the park/neutral switch.
 
#5 ·
If you want one all you need is a relay and some wire

Put the relay contacts in line with the wire to the starter solenoid then use your shifter switch to power the magnetic coil in the relay

You first gotta determine if your shifter switch is open or closed in park and neutral.

Next decide if you want the switch to provide power or ground for the magnetic coil in the relay and the rest is simple

You can even get fancy and require brake lights plus park or neutral if you wanted to


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#9 ·
If you have the ford style starter relay, You need to get one for an auto trans. It has a ground wire that goes to the NSS so it wont start unless the NSS supplies the ground.

The manual trans style grounds to the fender and is always "on(grounded)"
 
#12 ·
so my 88 FSM shows a park neutral safety switch that ties to the starter relay and would basically disengage power to the starter....I know I am butchering the FSM wording but the bottom line is if the ground is not running through the switch then no power to starter which is what I thing you are asking about. Page 837 on my FSM; the starter wiring diagram shows it. If you have a manual tranny you ground to the starter relay housing if auto you go to this park neutral switch c192 is the connection number.

Chief
 
#13 ·
Chief,
I think you hit the nail on the head. i have included the wiring diagram for my 87. It shows 3 different wires to the auto trans, (remember mine was a manual). hopefully someone can tell me which wire(s) I should be using. I think I want to reroute the wire to the starter solenoid thru the NSS, then back to the solenoid, BUT I'm not sure.
 

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#14 ·
CD...Don't use that manual you have. Its not accurate enough. Is that the chilton book?

You need to get one of these off ebay.



First, you need a new starter relay for the automatic wrangler.
It will have a terminal for a ground wire that will go to your shifters NSS. The other terminal off the NSS will go to ground. That's it. The relay cant energize unless the shifter provides the ground through the NSS



 
#17 ·
The picture I posted is the correct relay. It worked, except the micro switch can't be adjusted. I tried bending the arm, but it was either all or nothing. I' taking one of the old micro switches and see if I can elongate the rear hyole to get some adjustment.
 
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