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post #1 of (permalink) Old 04-08-2002, 07:23 AM
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Electrical Questions relatd to radio installation

I replaceing a radio in my 79 CJ7. The new radio has a yellow wire indicated to be wired to "the battery". I assume that means to a constant source of electricity so the radio retains the memory of stored stations and the time. Where would that constant source be? I was hoping to find someplace under the dash or the fuse box but when I look, the truth is I have no idea what I'm looking at or where to look. I've looked in my Haynes manual but again I don't understand what all the symbols etc mean. So, where and how do I hook up the yellow "battery" wire?
Thanks for the basics.
BT

Hey, I think I just found my phase, "Thanks, for the basics"
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post #2 of (permalink) Old 04-08-2002, 07:43 AM
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Re: Electrical Questions relatd to radio installation

The best point you could use is the 12 volt feed wire to the Oil Pressure guage. It's hot at ALL times... and it's not too far from the radio cut out.
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post #3 of (permalink) Old 04-08-2002, 07:47 AM
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Re: Electrical Questions relatd to radio installation

When looking at the back of the oil pressure gauge, is it the one that goes through the firewall? If so then, cut it in half and splice all together the original wire with the yellow "battery" wire? You're gonna have to bare with me on these questions.
BT
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post #4 of (permalink) Old 04-08-2002, 08:26 AM
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Re: Electrical Questions relatd to radio installation

Nope, I think you've centered on the sender wire coming from the oil pressure sender to the gauge... Take a look at Jaffer's Gaguge Page.... Bookmark this page! You're gonna need it someday anyway! It's found <a target="_blank" href=http://www.monsterslayer.com/jeep/Gauges.htm>here!</a>

Then look at the oil pressure gauge:


The hot lead is the right terminal - Red wire from the Ignition-on hot 12V. That's the one you want to splice into.
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post #5 of (permalink) Old 04-08-2002, 09:08 AM
 
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Re: Electrical Questions relatd to radio installation

I have another suggestion. Buy a 12 volt test light and find any wire that has 12 volts with the key in the off position (the light only costs $10 and will be an invaluable tool in your future). Also, didn't you say that you are changing the radio? If so, the original wire is only 12 volts with the key on, so you will need that one as well. There should be another one close by that is 12 volts all the time (cigarette lighter is a good choice).
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post #6 of (permalink) Old 04-09-2002, 07:11 PM
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Re: Electrical Questions relatd to radio installation

Some advice . Listen to what Leve said and invest in a GOOD 12 Volt test light and a Multi-meter . Both will prove a great addition to your tools when working on a Jeep . With either , you`ll know exactley what your fuse panel is up to .

Jeff
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post #7 of (permalink) Old 04-09-2002, 09:13 PM
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Re: Electrical Questions relatd to radio installation

Why not just run a wire(with a fuse) to the plus side of the battery? That's where mine is. Well actually, it's where the + hooks up to the starter on my 88yj.
Tim
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