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Old 02-23-2014, 10:09 PM   #1
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CB/aftermarket radio not playing nice

One of the first mods to my 13 jk was a cobra cb. It's the baseline 40$ model. Installed under the driver's seat. For power I tapped into the ignition controlled 12v cigarette port in the dash. No problems. Then I installed a kenwood dpx500bt head unit with the pac can harness and the pac harness for steering wheel controls. Recently noticed when out wheeling if I transmit on my cb the radio, dash gauges lose power, I get a chime, and the windshield wipers go across once. The cb still has power during this because I can still transmit. Also threw a code, not positive it's due to this but pretty sure, it's the lost communication with radio code.

Now this doesn't happen every time I key up but it did happens few times so I stopped using my cb in fear I fry something.

Maybe a bad ground? Or loose contact? Or maybe too much power being pulled from the power source?

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Old 02-24-2014, 09:39 AM   #2
Knows a couple things...

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Basic CB Radio Installation 101 is that CBs need to get their power directly from the battery. Probably the very worst source of power is from the cigarette lighter wiring which can cause problems just like you're having.

2-way radios including ham and CB can cause problems or pick up all kinds of noise from things like the alternator, ignition, etc. if you get the power from anywhere but directly from the battery. I don't know the JK but if the JK has a PDC (Power Distribution Center) in the engine compartment that is full of relays & fuses, the odds are good that it has a single heavy power wire feeding it directly from the battery. That wire would be attached to a heavy lug with a nut on top, you could connect your CB's power wire there to avoid connecting onto the battery connector.

Don't worry about the CB not turning off with the ignition by wiring it like that. CB radios don't draw even close to enough power to drain the battery when accidentally left on unless you left it on for weeks without starting the engine. Plus there will be times you want to use your CB offroad without the ignition being on.

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Old 02-24-2014, 12:30 PM   #3
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Wanted to help you out, but Jerry did it for me. He's spot on in his reply.
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Old 02-25-2014, 09:30 PM   #4
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Quote:
Originally Posted by Jerry Bransford View Post
... the odds are good that it has a single heavy power wire feeding it directly from the battery. That wire would be attached to a heavy lug with a nut on top, you could connect your CB's power wire there to avoid connecting onto the battery connector...
It should not have to be said, but for safety's sake, we need to say it anyway...
Yes, power the CB from the battery.
But make sure you have a fuse inline on the positive side.

You'd think that this would be a no-brainer.
But people have a way about taking shortcuts when it comes to wiring their automotive electronics.
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Old 03-03-2014, 01:39 AM   #5
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Thanks guys for the help, will deffinately re wire it to the battery. And yes I am running an inline fuse, but thank you for pointing that out!
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Old 03-03-2014, 11:08 AM   #6
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Quote:
Originally Posted by vertical horizons View Post
It should not have to be said, but for safety's sake, we need to say it anyway...
Yes, power the CB from the battery.
But make sure you have a fuse inline on the positive side.

You'd think that this would be a no-brainer.
But people have a way about taking shortcuts when it comes to wiring their automotive electronics.
And the fuse should be very close to the battery connection. Definitely before the wire passes through any sheetmetal.

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