Wiring diagram needed!! helps

[brianlr7773]

Hi,

Ok I got a 79 bronco custom that the previous owners hacked the wireing real bad while trying to install a coool stereo (never got it in) caused fire blaa blaa blaaa. Anyways got everything repaired except now I am down to the last 4 wires wich should be to the rear window switch in the a/c cluster.

The wires are real thick. one is black (ground?) one is white (positive?) and then there are two purple wires? The switch was snapped of the cluster and i dont have one so I thought i would use a fuel tank switch of another cluster for the time being.

I have the standard chiltons /hayes and there useless. I really need to know what each wire is and if possible can anyone how the what wire does what when the switch is flipped up or down.

Thanks a ton in advanced! I can't wait to get this done and get the interior back together!

Brian

 

[Bradt]

Which switch do you mean? The one that puts the window up and down, or a defrost switch?

brad

 

[brianlr7773]

Which switch do you mean?  The one that puts the window up and down, or a defrost switch?
brad

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The one for the rear window or at least the only switch i know that goes on the far right hand side of the a/c heater controls, and goes up and down.

 

[Seabronc]

That is a special switch and you can't just use any switch. It has a special internal wiring arrangement. The attached diagram shows how it works and the correct wiring. it is the same for all years.

 

[Bradt]

That's what I was thinking. The window switch has three positions, and a fuel tank switch has two positions.

I would guess the white is going to the fuse box, black to ground, and the two purples to the key switch, but why would they both be purple?

brad

 

[brianlr7773]

That's what I was thinking.  The window switch has three positions, and a fuel tank switch has two positions.
I would guess the white is going to the fuse box, black to ground, and the two purples to the key switch, but why would they both be purple?

brad

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good question, I am gonna go triple check those wires cause that diagram only showed one... hmmm

 

[brianlr7773]

That is a special switch and you can't just use any switch.  It has a special internal wiring arrangement.  The attached diagram shows how it works and the correct wiring.  it is the same for all years.

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WOW thanks soooooo much thats exactly what i needed!!!! Where you get the diagrams?

 

[brianlr7773]

Ok, well after getting the diagram and taking a look at my wires I am still not sure whats up.

My wires are as follows:

Black (ground)

a very large white / black stripe (positive)

Purple / green stipe

Purple / dark blue or black stripe (real small stripe hard to tell)

The diagram does not show my white / black wire (but no big deal it is positive) or my purple with dark blue or black stripe.

I sure don't want to wire it wrong and toast my many hours repairing and resoldering of the harness damaged by the previous owner.

Anyone have any clue? Does anybody have the ability to take a picture of the same plug / switch I am refering to? I have scoured my local junk yards (vegas) and there right now are no 78 or 79 broncos only tons of the 70's F-Series and they dont have the same wires as far as i can tell.

I am stuck. I wish i could just find a good wiring harness to replace mine and be done with it but no luck yet.

 

[Bradt]

Here's where you're in luck. The rear window works by swapping polarity depending which way the window needs to go. If you're correct about your ground and hot wire, then the other two being messed up won't hurt anything.

I'd be very surprised if swapping the hot and ground hurt anything as well.

Hook them up, and if the switch works backwards reverse them.

brad

 

[brianlr7773]

Here's where you're in luck.  The rear window works by swapping polarity depending which way the window needs to go.  If you're correct about your ground and hot wire, then the other two being messed up won't hurt anything.
I'd be very surprised if swapping the hot and ground hurt anything as well.

Hook them up, and if the switch works backwards reverse them.

brad

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I agree it should not matter purple wire should get current when the switch is flipped. It will make the window go up or down , my big problem is i dont have the switch connector so i dont know what wire goes to what terminal on the switch, i am not about to smoke the harness by plugging them in wrong on the switch. Sucks cause i have not been able to locate a 78 or 79 bronco at the salavge yards to inspect and get pictures of the plug in question.

 

[jkdillard]

its not going to matter what wire goes where. if you have the wires connected and the window goes up when you want it to go down just switch the connections around.

 

[Bradt]

Like jkdillard says, it won't matter as long as you don't have the hot/ground confused with the ones going back

.

I looked for the diagram I saw earlier but couldn't spot it again. the two purple wires (one should actually be pink) definitely go to the back.

You're not going to fry the motor or wiring because it is designed so that both wires will carry a load depending on which way the switch is flipped. You still need a three way switch though.

here's how the switch works. Look at seabroncs diagram for this. When you press the up button the circuit connects so that your sending current through the P/LG wire, and the other acts as a ground. Hit the down button and it does exactly the opposite.

There's really not that much you could do to fry it as long as you have a switch that has an up, down, and off position. Leving the circuit with a load on it in either direction can't be good for the motor.

If you get the hot/ground wire backwards and the other two right, the switch will just work backwards.

If you get the ground/hot right, and the other two reversed, same thing.

If you get both sets backwards then you screwed up just right and it will work like it's supposed to.

The only other thing I can think of to do ias a temporary fix would be install two buttons. One for up, and one for down.

brad

 

[brianlr7773]

Like jkdillard says, it won't matter as long as you don't have the hot/ground confused with the ones going back.

I looked for the diagram I saw earlier but couldn't spot it again.  the two purple wires (one should actually be pink) definitely go to the back.

You're not going to fry the motor or wiring because it is designed so that both wires will carry a load depending on which way the switch is flipped.  You still need a three way switch though.

here's how the switch works.  Look at seabroncs diagram for this.  When you press the up button the circuit connects so that your sending current through the P/LG wire, and the other acts as a ground.  Hit the down button and it does exactly the opposite.

There's really not that much you could do to fry it as long as you have a switch that has an up, down, and off position.  Leving the circuit with a load on it in either direction can't be good for the motor.

If you get the hot/ground wire backwards and the other two right, the switch will just work backwards.

If you get the ground/hot right, and the other two reversed, same thing.

If you get both sets backwards then you screwed up just right and it will work like it's supposed to.

The only other thing I can think of to do ias a temporary fix would be install two buttons.  One for up, and one for down.

brad

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/emoticons/[email protected] 2x" width="20" height="20" /> Alright, now i got it down thanks for the detailed info. I was wondering about what wire becomes grounded when switched, so that just answered it for me.

THANK YOU!!! Been a great help. Now if only my replacment rear window switch would get here I would have this done!

 

[Ziggy]

According to my 79' wiring diagram, the dash switch has a purple w/green stripe wire (down) and purple w/blue (up) stripe that feed from the dash swith to the rear key switch and a black wire is a ground wire that is attached to the frame under the dash. There is also a blue w/black wire that is your power in feed from the accessory feed relay. I confimed all of this with my spare wiring harness and window switch. If the window goes down when the dash switch is flipped/pushed up, reverse the two purple wires on the dash switch.

 

[brianlr7773]

According to my 79' wiring diagram, the dash switch has a purple w/green stripe wire (down) and purple w/blue (up) stripe that feed from the dash swith to the rear key switch and a black wire is a ground wire that is attached to the frame under the dash.  There is also a blue w/black wire that is your power in feed from the accessory feed relay.  I confimed all of this with my spare wiring harness and window switch.  If the window goes down when the dash switch is flipped/pushed up, reverse the two purple wires on the dash switch.

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Would you be interested in selling your spare harness?

 

[Ziggy]

If it was just a "tagged on" seperate harness I would. But since it is the entire harness under the dash, fuse panel and such - sorry. I am restoring my first Bronco and may need it.

 

[brianlr7773]

If it was just a "tagged on" seperate harness I would.  But since it is the entire harness under the dash, fuse panel and such - sorry.  I am restoring my first Bronco and may need it.

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Thats cool, never hurts to ask B)

 

[brianlr7773]

Ok, so now I have a new question for all you wire dudes out there. I have a 78 F-150 XLT Ranger 4x4 truck, I was wondering if the main wireharness (DASH, AND FRONT CLIP) is the same as the bronco (79 Custom). I have looked at every part closly and it looks the same. I want to know if i can use the pickup harness in the bronco.

The only part i do question is where the rear window switch is, will the wires still be there on the pickup harness? I can't imagine ford would make 2 diffrent dash harnesses for the bronco and f-150 since there very much the same from the dash forward.

Let me know what u guys think.

 

[brianlr7773]

Ok, needs some more help with the wireing. I have spent tons of money completly redoing my wiring, interior, motor, etc..etc.. Well now I am haveing a big problem with the power to the truck.. The truck has no power to anything inside the truck, however i can start the truck, turn on the hazards, and blinkers, but nothing else will power on. Can someone tell me what wire is the main power wire to the fuse block? I though it would be the one on the positive side of the solenoid. It has a large metal fuse/breaker on it and a large black/yellow wire coming off i, i checked the cable for power and its pulling 12volts. I am lost... this sucks, I so wish i could have found a complete wireing harness for the bronco to replace it.

I have been very carefull while repairng all the wiring and matched all the wires to the correct ones after removing the melted parts (from engine fire) everything is soldered and shrink tubed..

Anyone gots the awnser? or mabey a diagram?

Thanks