Does anyone have a running 4.0 in their Bronco II?

amberbrush · Post by **amberbrush** » Tue Nov 20, 2007 7:20 am

O.k., I am having some trouble with my swap and not receiving much input so I am hoping someone can offer me some advice. My 4.0 out of a 1994 Explorer is in my 1988 Bronco II and all hooked up so I would have said the hard part is done until it won't start. It seems like I don't have power to anything. I thought I had hooked up the right wires....

1. Red/Green accessory run
2. Pink (Start signal)
3. Pink/Black (Fuel pump)
4. Black (Fuel Pump ground)

I have nothing with these wires hooked up. My fuel pump doesn't even come on when I hit the key. What am I doing wrong?

DBrown · Post by **DBrown** » Tue Nov 20, 2007 11:25 am

the only thing I can give you advice on is to get a wiring diagram for both trucks and lable the wires on both harnasses. then attach what is nessary.

on my 86 harness there were around 5 different connectors at the driver side of the firewall. the large red/green stripe was the main power to power everything in the cab and the pink/black strip is for the fuel pump. I want you to realize this though, ford is notorious for changing wire colors at a whim and even if you truck was the same year it could have different colors.

you realy need to break the systems down to stop your self from getting to confused.
I first got power in the cab.
got the fuel pump on.
got power to the ignition.
figured out the starter.

you can wire that harness on the ground and install it but if you are kindof new to this stuff it will kill your temper real quick.

amberbrush · Post by **amberbrush** » Tue Nov 20, 2007 11:44 am

I do have EVTM manuals for both the donor vehicle and my Bronco II. I guess what I don't understand is why when I hook up my red/green wires together it is supossed to power everything in the cab like you say but I have nothing. Obviously something is being overlooked.

Yes, I am new to this. I can pull a motor out of anything and put it back into something but when it comes to wiring I am dumbfounded. I will think I got it down to find out that it still isn't right. I have stared at both my manuals for countless hours. I probley bit more off than I can chew on this one.

DBrown · Post by **DBrown** » Thu Nov 22, 2007 5:35 am

did you strip the covering off the harness from the donar truck and chase the power wires to the battery?

most of the time you can just follow the wires that you know plug into what you are looking for and get it right.

like start at the batt. and follow the power wire till one of them goes into the fire wall. it will be a larger guage wire. the one from my donar harness was red/green and so was the main power wire going into the fire wall.

also check the gorunds and make sure everything is tied together and grounded. with out grounds it will not give you anything. the circuit has to close.

to get the ignition power follow the red wire on the EDIS back...it will merge with other power wires and should get you going in the right direction

do you have a volt meter?

amberbrush · Post by **amberbrush** » Thu Nov 22, 2007 12:19 pm

I looked at my manuals again. The constant yellow wire that goes to the ignition in both the Explorer and Bronco II is hot at all times according to the schematic. After I got looking at it, I don't think that I hooked the explorer harness ignition wire to my ignition to make it hot. Would this create the problems I am having since my ignition wouldn't be hot therefore not powering anything with the key on?

I did strip everything off the donor truck and have hooked everything to my battery and starter relay as it lie in the Explorer.

I have used my test light to check some wires in the Explorer harness and do see that I have power to several thicker ones that plug into the firewall but I do not have the majority of them running to anything. I do have both red/green wires in both harnesses connected together but that is one wire that is not hot.

DBrown · Post by **DBrown** » Fri Nov 23, 2007 5:38 am

did you check the fuses?

try doing this...if you have stripped the new harness do the same to the old one and lay them out like they were in the truck now trace the wires individualy and lable them. this might clear up some questions.

I know you haven't asked a question about it but one of the clips commong out of the fire wall is for the alt. that should be fairly simple. it has 3 wires. simply connect them to the wires comming off the wires to the alt. if I remeber correctly you only need to connect the large blck one and the green/red to the green red. and that should get you good on that one.

small red/blue stripe is the signal for the starter
pink/black is for the fuel pump
large red/green strip is power going into the cab

leave the lighting harness in tact being as you don' need to splice any wires in to that.

honestly I think once you get power going into the cab you will move fast. because you can start testing wires with the key on and figure it out that way. it took me about 3 tries before I got mine totaly right so don't think you are the only one having problems with it the first time. I have done 2 total and it gets easier. also you will have a very good understanding of your truck by the time it is all said and done.

amberbrush · Post by **amberbrush** » Fri Nov 23, 2007 6:29 pm

Well, I got power to my ignition which means I have power to my headlights, wipers, radio, etc.

I found that I did not have the ignition wires from the B2 harness hooked to the starter solenoid. Once I found this out I had power to my cab. Well, I about celebrated once this happened as I figured I would for surely get the thing to start but I wasn't so lucky. O.k. so here is what I did........

Please tell me if I am wrong somewhere but I have spliced the 14 guage pink wire from the Explorer harness to the red/blue wire on the bronco II harness. I then ran that over to the solenoid and hooked it in the matching spot. I thought this was all that was needed to get it to turn over but I have nothing. Am I doing something wrong?

DBrown:

Regarding the alternator, I hooked mine up exactly how it was hooked up on the Explorer. I didn't do anything with my old alternator wires on the Bronco II. Did I do this wrong? From the manual I have, the Explorer wires run to the starter solenoid, ammeter and the power distribution box. Will this not work?

DBrown · Post by **DBrown** » Tue Nov 27, 2007 3:57 pm

Well, I got power to my ignition which means I have power to my headlights, wipers, radio, etc.

this is a big step in the right direction...before you go to the starter did you check to see if you had power at the coil? just un plug it and check the red wire for power with the key in the on possition. if this has power and you didn't do anything to the wires in the ignition system then you have power to all the ignition components needed to run the motor.

also listen when you turn the key to the on position and see if you can hear the fuel pump kick on.

starter: here is the thing, the starter for the 4.0L has a selonoid on the starter. so when I wired mine I just ran the red/blue wire comming out of the fire wall to the seloniod on the starter then a power wire down to it from the batt. or any other easy connection that can give it enough juice.

it sounds like you are getting close, just go slow and double check everything to make sure you get it right as you bring the systems up to speed. also don't forget to hook up all the grounds!