1994 Radio question - JeepForum.com
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post #1 of 11 Old 07-21-2019, 02:35 PM Thread Starter
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1994 Radio question

Hi all,
It's been awhile since I've worked on my Jeep but decided to finally put in a radio. PO had the Jeep stolen and radio and other things removed from it long ago. I bought a used marine radio (Sony dsx M50BT) and speakers for the waterproofing/resistance. I used new wires for my speakers and haven't used anything from the OEM harness...yet

I'm about done wiring it but the new marine unit wants a 12v+ from the ignition when it's in the accessory position. Is there a wire from the OEM harness that has this?

Worst case I can tie it into my fan switch, so when i flip that to have the electric fan and USB turn on, I'll have that go to the radio. Though it'd be nice to have the radio on without having to have my fan on, or to add another switch only for the radio.

Then i just need a constant 12V and the ground to use but I'll tie that into those lines I am using for my 2x 12V cigarette lighters (they are on 12ga lines). Though I am not sure if I need something isolated when wiring speakers/radio, first time I've wired in speakers, I just don't want interference or static.

Your help/advice is appreciated.

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post #2 of 11 Old 07-22-2019, 06:23 AM
mikewiz38
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It sounds like the OEM harness is still there. I'd look into getting an aftermarket OEM to aftermarket wiring harness for the radio, just so you don't have to cut the wires and can easily identify them. If you don't want to go the aftermarket route, there's a wiring diagram attached. I've just used the speaker connections on it and they were right, but I would use a multimeter to make sure that the ACC/Ignition wire is 12v (which is the red wire). Then, according to the diagram, the pink wire is the constant 12v. For the ground, I would just use a frame ground. I believe that's a bolt on the firewall....or I know there's a little bracket that has a spot for a spade connector to sit on that's about upper-right of the gas pedal.

But again, make sure you use the multimeter to make sure the wires are constant 12v and acc/ign 12v!

EDIT: Oh, and for tying into the cigarette lights. I wouldn't do it, but it's just me. They may be on a different circuit, and definitely a different ground. I would think you would have a higher probability for alternator whine if you tie into the lighter power and ground.
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Last edited by mikewiz38; 07-22-2019 at 06:25 AM. Reason: added cigarette lighter paragraph.
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post #3 of 11 Old 07-22-2019, 06:32 PM Thread Starter
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Originally Posted by mikewiz38 View Post
It sounds like the OEM harness is still there. I'd look into getting an aftermarket OEM to aftermarket wiring harness for the radio, just so you don't have to cut the wires and can easily identify them. If you don't want to go the aftermarket route, there's a wiring diagram attached. I've just used the speaker connections on it and they were right, but I would use a multimeter to make sure that the ACC/Ignition wire is 12v (which is the red wire). Then, according to the diagram, the pink wire is the constant 12v. For the ground, I would just use a frame ground. I believe that's a bolt on the firewall....or I know there's a little bracket that has a spot for a spade connector to sit on that's about upper-right of the gas pedal.

But again, make sure you use the multimeter to make sure the wires are constant 12v and acc/ign 12v!

EDIT: Oh, and for tying into the cigarette lights. I wouldn't do it, but it's just me. They may be on a different circuit, and definitely a different ground. I would think you would have a higher probability for alternator whine if you tie into the lighter power and ground.


Thanks Mike! That's exactly what I was looking for.
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post #4 of 11 Old 07-31-2019, 06:35 PM Thread Starter
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Alright Question part 2.

I used a multimeter to test the ACC voltage and it's 3.5v when on ACC, when the Jeep is on it's 4.1 volts. This seems low, I was expecting 12V. Nothing else was on (no headlights, dash illumination, etc.). Turning those on and off didn't alter the voltage.

I doubt the ACC from the stock radio harness supposed to be that low voltage? If I use the wiring off of a a nearby switch I put in it's at a solid 12.1V. So any idea what may be up with my stock wiring harness ACC voltage?


Edit:
Temporarily using alligator clips instead of soldering. Radio won't turn on off the ACC wiring from the stock radio harness since the voltage is too low. Currently running it off splice from my electric fan switch.
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post #5 of 11 Old 08-01-2019, 05:28 AM
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You're making this much harder on yourself than it needs to be. Just go buy a couple of fuse taps https://www.amazon.com/Pixnor-Circui...34676336&psc=1. Connect one to the yellow wire in the aftermarket radio harness this will be constant hot, one to the red wire in the aftermarket radio harness this will be switched hot. Go to the fuse block under the dash use courtesy light fuse as the constant and any other fuse that's switched.

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post #6 of 11 Old 08-01-2019, 06:31 AM
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x2 with mudbug. Also check your radio fuse for the switched ignition feed.

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post #7 of 11 Old 08-01-2019, 12:47 PM
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My '91 actually has a spot labeled "Radio" in the fuse box. It's half a fuse position and takes a push in style clip. It's 12v only when the ACC or Ignition is on.

Have one also labeled "clock" - nothing connected to that one- may be why my clock doesnt keep time with the car off.
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post #8 of 11 Old 08-01-2019, 03:23 PM
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Quote:
Originally Posted by adiubald View Post
My '91 actually has a spot labeled "Radio" in the fuse box. It's half a fuse position and takes a push in style clip. It's 12v only when the ACC or Ignition is on.

Have one also labeled "clock" - nothing connected to that one- may be why my clock doesnt keep time with the car off.

My 94 has the radio connector too. I never looked for the clock connector, since I don't have a clock.

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post #9 of 11 Old 08-01-2019, 04:42 PM
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https://www.jeepforum.com/forum/f12/l...topics/2763434

No kidding. This is pretty good info.

If it’s a higher power head unit I personally would run a relay and feed from an auxiliary fuse box or relay and dedicated fuse/wire. The ACC leg can have enough trouble keeping up without help imho.

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post #10 of 11 Old 08-01-2019, 05:16 PM Thread Starter
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Thanks for the advice everybody. I think I'm going to go with mudbug's idea of going off the fuse, so I can have my radio on without having my efan on (or having to disconnect it). That radio thread is great, though doesn't mention why my ACC voltage is low, I have LEDs for dash lights and courtsey light so the V drop should be less than OEM. I found out you can just ground the radio to it's harness as the dash metal is grounded. Though I made a new ground to a bolt by the steering wheel, but it's good to know.



I'm hoping to finish up soon then post some pictures of what I did even if it's not perfect.
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post #11 of 11 Old 08-01-2019, 08:51 PM
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Quote:
Originally Posted by xpage View Post
...though doesn't mention why my ACC voltage is low.....as the dash metal is grounded. Though I made a new ground to a bolt by the steering.
Your voltage is low because your connections and/or battery and charging cables and wires need to have their contact points cleaned and maybe replaced. Most likely. That is a common YJ malady now that these beautiful throwback machines are becoming old.

Fix the dipstick, firewall, alternator, PDC, and battery cables and you’ll have 12.6V

Seriously. You are not the first. Fix it before the fire and you won’t have to make that call to the insurance company. 🙂

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