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Old 04-05-2005
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acc. power

I have a Cobra 18 WX ST II CB radio I am putting in my truck. It is a three wire hookup. One of the wire is a acc. wire so the radio cannot be accidently left on. I was assuming the best place to wire this in was the radio acc. wire. However I also have my OHC hooked in here and also wanted to switch another relay with this wire. My problem is I don't know how much everything draws so I don't know how many devices I can switch with the radio acc. wire. Any help would be appreciated. Thanks,

-Luke
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Old 04-05-2005
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Quote:
Originally Posted by shadyluke
I have a Cobra 18 WX ST II CB radio I am putting in my truck. It is a three wire hookup. One of the wire is a acc. wire so the radio cannot be accidently left on. I was assuming the best place to wire this in was the radio acc. wire. However I also have my OHC hooked in here and also wanted to switch another relay with this wire. My problem is I don't know how much everything draws so I don't know how many devices I can switch with the radio acc. wire. Any help would be appreciated. Thanks,

-Luke
I don't know what the draws are for the various items.

There are only two fuses that are hot in both ACC and RUN. You don't have a lot of choice here.

#20 (7.5A) feeds the audio unit, the GEM and the power window safety relay. The other is #16 (30A) for the windshield wipers.

You could use a relay triggered by the wire from #20 to control a new 20A circuit for your add-ons. That should give you all the capacity you would ever need.
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Old 04-05-2005
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That sounds like a good way to do it. I just don't have the time to do it by this weekend. Do you think I could make my CB plug into the aux power pt. I would twist the hot and acc wires of the CB together so then itz a two wire hook up. There is a 1 amp fuse in the acc wire and a 2 amp fuse in the hot wire. That means I need at least a 3 mp fuse in the end that plugs into the aux point. I only need it for the weekend then the permanent install will wait till this summer.
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Old 04-05-2005
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Typically, the ignition input on a two way radio is very low current. It is usually not actually supplying power to anything. The main power wires are the ones that actually have the draw. If it has the original fuse on the ignition wire, see how many amps it is. If it is only a little fuse, like 1 amp or something, you'll know for sure.
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Old 04-05-2005
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Quote:
Originally Posted by shadyluke
That sounds like a good way to do it. I just don't have the time to do it by this weekend. Do you think I could make my CB plug into the aux power pt. I would twist the hot and acc wires of the CB together so then itz a two wire hook up. There is a 1 amp fuse in the acc wire and a 2 amp fuse in the hot wire. That means I need at least a 3 mp fuse in the end that plugs into the aux point. I only need it for the weekend then the permanent install will wait till this summer.
I have an accessory plug on my CB that goes right into the power point. Don't remember where I got it, though.

For the permanent install, I would first try running it directly from the radio fuse for a while just to see what happens. What could it cost you besides a fuse or two? Ford probably builds in some reserve capacity to allow a cushion for aftermarket head units. It might work fine without going to the trouble of adding a relay-activated circuit.
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Old 04-05-2005
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i have my cb (has a constant wire and an accessory wire as well) with the red wire going under a constant fuse. i believe its my power point accessory, but i leave my cb on all the time and she works fine with no noticable drain on the battery.
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Old 04-05-2005
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I tried the accessory plug tonight. Red wire has a 2 amp fuse and orange wire had a 1 amp fuse. I twisted these wire together and made that positive on the power point and the black is the ground on the power point. My accessory plug also has a fuse in the end of it. I put a 4 amp fuse in here. When I tried turning the CB on I just keep blowing fuses. The CB worked fine when I pulled it out of my old truck. I guess I will just have to hard wire it into my truck. Probably won't happen till fri night by the camp fire.
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Old 04-05-2005
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Originally Posted by shadyluke
I tried the accessory plug tonight. Red wire has a 2 amp fuse and orange wire had a 1 amp fuse. I twisted these wire together and made that positive on the power point and the black is the ground on the power point. My accessory plug also has a fuse in the end of it. I put a 4 amp fuse in here. When I tried turning the CB on I just keep blowing fuses. The CB worked fine when I pulled it out of my old truck. I guess I will just have to hard wire it into my truck. Probably won't happen till fri night by the camp fire.
Sounds like you may have the polarity reversed somehow. The center of the plug should be positive and the outer shell ground.
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Old 04-06-2005
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Thats the way I wired it.Have to play with it some more.
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