Switched power source
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
What year truck? I wonder if there is a switched auxiliary connector right on the fuse panel?
I know some panels had them, but not every one.
On the really early switches had a stud coming out of the back of the ignition switch that was used for accessory power on the black with green striped wire.
But I don’t think the 70s pickups kept that arrangement.
If you don’t mind the gauges coming on with the key in either position, the black with green accessory wire should go to.
If you want it in the ON position only, then find a branch of the green with red stripe wire. The obvious ones are under the hood, but there should be at least one under the dash.
Or you could tap into it right at the back of the ignition switch.
Another go to, is the actual instrument cluster itself. Where the power for the instrument voltage regulator would be what you need. But not the Output side, just the input side where it’s getting a full 12 V. It’s the only side you have access to anyway, if you have a truck cluster with the circuit board on the back.
I don’t remember what they use for wire color on the IVR. On really old trucks and Broncos. It was the same black with green, but I’m pretty sure that is a different color on the full size pickups of our era.
I know some panels had them, but not every one.
On the really early switches had a stud coming out of the back of the ignition switch that was used for accessory power on the black with green striped wire.
But I don’t think the 70s pickups kept that arrangement.
If you don’t mind the gauges coming on with the key in either position, the black with green accessory wire should go to.
If you want it in the ON position only, then find a branch of the green with red stripe wire. The obvious ones are under the hood, but there should be at least one under the dash.
Or you could tap into it right at the back of the ignition switch.
Another go to, is the actual instrument cluster itself. Where the power for the instrument voltage regulator would be what you need. But not the Output side, just the input side where it’s getting a full 12 V. It’s the only side you have access to anyway, if you have a truck cluster with the circuit board on the back.
I don’t remember what they use for wire color on the IVR. On really old trucks and Broncos. It was the same black with green, but I’m pretty sure that is a different color on the full size pickups of our era.
Thread Starter
|
Mountain Pass
Joined: Jul 2012
Posts: 149
Likes: 21
From: Citrus Heights , CA
What year truck? I wonder if there is a switched auxiliary connector right on the fuse panel?
I know some panels had them, but not every one.
On the really early switches had a stud coming out of the back of the ignition switch that was used for accessory power on the black with green striped wire.
But I don’t think the 70s pickups kept that arrangement.
If you don’t mind the gauges coming on with the key in either position, the black with green accessory wire should go to.
If you want it in the ON position only, then find a branch of the green with red stripe wire. The obvious ones are under the hood, but there should be at least one under the dash.
Or you could tap into it right at the back of the ignition switch.
Another go to, is the actual instrument cluster itself. Where the power for the instrument voltage regulator would be what you need. But not the Output side, just the input side where it’s getting a full 12 V. It’s the only side you have access to anyway, if you have a truck cluster with the circuit board on the back.
I don’t remember what they use for wire color on the IVR. On really old trucks and Broncos. It was the same black with green, but I’m pretty sure that is a different color on the full size pickups of our era.
I know some panels had them, but not every one.
On the really early switches had a stud coming out of the back of the ignition switch that was used for accessory power on the black with green striped wire.
But I don’t think the 70s pickups kept that arrangement.
If you don’t mind the gauges coming on with the key in either position, the black with green accessory wire should go to.
If you want it in the ON position only, then find a branch of the green with red stripe wire. The obvious ones are under the hood, but there should be at least one under the dash.
Or you could tap into it right at the back of the ignition switch.
Another go to, is the actual instrument cluster itself. Where the power for the instrument voltage regulator would be what you need. But not the Output side, just the input side where it’s getting a full 12 V. It’s the only side you have access to anyway, if you have a truck cluster with the circuit board on the back.
I don’t remember what they use for wire color on the IVR. On really old trucks and Broncos. It was the same black with green, but I’m pretty sure that is a different color on the full size pickups of our era.
74 F250 highboy 360
Thanks.... for the black with green accessory wire - is this just any wire in the bunch that is this combo? or a specific one coming out of the ignition switch?
Thread Starter
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Mountain Pass
Joined: Jul 2012
Posts: 149
Likes: 21
From: Citrus Heights , CA
I've got a multimeter, but don't feel like cutting wires our pulling things out if someone can point out a quick solution via which wire to look for. (and not rude at all, appreciate the thought)
Laughing Gas
Joined: Aug 2020
Posts: 821
Likes: 292
From: Pelham Alabama
Hey turtleman
I usually use the Cig. lighter wire.
Heavy enough, and not usually used for anything else.
Usually,,,,Switched power.
Use that meter like mentioned above.
I usually use the Cig. lighter wire.
Heavy enough, and not usually used for anything else.
Usually,,,,Switched power.
Use that meter like mentioned above.
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Lead Driver
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Laughing Gas
Joined: Aug 2020
Posts: 821
Likes: 292
From: Pelham Alabama
Well oneton no one said it is for sure switched power.
If you read my post I THINK I said usually,,,,, and to use that meter to find out.
Just a good idea for someone to think about...
These old trucks no telling how they are wired... LOL
If you read my post I THINK I said usually,,,,, and to use that meter to find out.
Just a good idea for someone to think about...
These old trucks no telling how they are wired... LOL
Thread Starter
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Mountain Pass
Joined: Jul 2012
Posts: 149
Likes: 21
From: Citrus Heights , CA
I just dug deeper and found this plug that seems to have 3 slots, 1 taken and 2 open maybe....
think this might be it? (gonna try and get a better picture, but this plus is TUCKED up in there)
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
My misinterpretation!
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
Theoretically, it should do the job for you. But as already mentioned, get a meter or test light for confirmation.
Laughing Gas
Joined: Aug 2020
Posts: 821
Likes: 292
From: Pelham Alabama
Hey Oneton
I hope you didn:t take my post as sarcastic as it may sound.
I am a just say it like I think it guy.
I have been told I must have a screen door between my brain and mouth.
Always been that way and at 79 too late to change now.... lol
I hope you didn:t take my post as sarcastic as it may sound.
I am a just say it like I think it guy.
I have been told I must have a screen door between my brain and mouth.
Always been that way and at 79 too late to change now.... lol
Cargo Master
Joined: Oct 2020
Posts: 2,692
Likes: 790
On my 79 F350 I didn't have enough switched with the key power sources so I added an aux fuse box out under the hood that's powered through a fusible link and switched with a relay. That might be an option too if you've got a lot of extra stuff.
