constant 12v for radio/cd player - Vintage Mustang Forums
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post #1 of 18 (permalink) Old 09-11-2019, 11:46 AM Thread Starter
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constant 12v for radio/cd player

I installed an old 1997 sony 10 disc player I found. Still works. Anyway I need to find a constant 12v lead. Under the dash I found what I thought was a lead. Turns out it was for a courtesy light so when I close the door the power is turned off I guess by the door. Anyway I found a red 3 inlet plug right by the ignition. Anyone know what this is for? Rally pack maybe. I can test it but thought I'd ask to see if anyone knows the original purpose for that.


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post #2 of 18 (permalink) Old 09-11-2019, 11:56 AM
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Run some 10ga wire straight to the battery. That's what I used to do for my stereos back in the day.
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post #3 of 18 (permalink) Old 09-11-2019, 12:05 PM
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Its better to have ignition on than constant hot if you ask me...being able to have the radio be on while the key is not in the ignition is just asking for a drained battery when you inevitably turn the volume down and forget about it. Relays specifically for your accessories are your friend.
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post #4 of 18 (permalink) Old 09-11-2019, 12:16 PM
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I agree.. I'd have it on a "Switched" IGN ON Source as well....and not a "LIVE" "Constant"one.

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post #5 of 18 (permalink) Old 09-11-2019, 12:46 PM
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Some radios need a constant power for clock and other functions as well.
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post #6 of 18 (permalink) Old 09-11-2019, 12:47 PM
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Quote:
Originally Posted by wicked93gs View Post
Its better to have ignition on than constant hot if you ask me...being able to have the radio be on while the key is not in the ignition is just asking for a drained battery when you inevitably turn the volume down and forget about it. Relays specifically for your accessories are your friend.
I ran right to the battery for decades and never once had a dead battery. then again, I never turned the music down.
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post #7 of 18 (permalink) Old 09-11-2019, 01:01 PM
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Originally Posted by Mr66Mustangcam View Post
Anyway I found a red 3 inlet plug right by the ignition. Anyone know what this is for? Rally pack maybe. I can test it but thought I'd ask to see if anyone knows the original purpose for that.
Not sure what the red 3 inlet plug is for, but I have my radio power coming from the cigarette lighter.

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post #8 of 18 (permalink) Old 09-11-2019, 02:18 PM
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Yes for the rally-pac.
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post #9 of 18 (permalink) Old 09-11-2019, 02:38 PM
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Ignition switch "B" terminal. Probably YELLOW or YEL/BLK.

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post #10 of 18 (permalink) Old 09-11-2019, 02:39 PM
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The only true constant 12-volt wire in a Mustang is the big wire running to the ignition switch. You just need to run a 16 gauge wire with 2 amp fuse to the battery or solenoid terminal. The constant battery wire on a car radio simply uses a few milliamps to keep the presets and clock functioning.
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post #11 of 18 (permalink) Old 09-11-2019, 02:44 PM
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Quote:
Originally Posted by cougar70 View Post
The only true constant 12-volt wire in a Mustang is the big wire running to the ignition switch. You just need to run a 16 gauge wire with 2 amp fuse to the battery or solenoid terminal. The constant battery wire on a car radio simply uses a few milliamps to keep the presets and clock functioning.
Actually, no. You can also pick up constant 12V at the fuse box (Cigar Lighter) or at the Lighter, itself. If you go to the fuse panel you can use a fuse tap like these....

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post #12 of 18 (permalink) Old 09-11-2019, 03:58 PM
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Actually, no. You can also pick up constant 12V at the fuse box (Cigar Lighter) or at the Lighter, itself. If you go to the fuse panel you can use a fuse tap like these....

I forgot about that. Seems the glove compartment lamp might be too.
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post #13 of 18 (permalink) Old 09-11-2019, 04:05 PM
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Actually, no. You can also pick up constant 12V at the fuse box (Cigar Lighter) or at the Lighter, itself. If you go to the fuse panel you can use a fuse tap like these....

I didnt even know that kind of tap existed...that's pretty awesome being completely reversible...wonder if there is a similar tap for the later non-bus style fuses
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post #14 of 18 (permalink) Old 09-11-2019, 04:08 PM
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Some radios need a constant power for clock and other functions as well.
Many have two power wires. Red goes to ignition switch, yellow goes to constant power. Yellow is often a larger wire making me think the red really controls an internal relay that will turn on all functions but memory from power that enters through the yellow.

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post #15 of 18 (permalink) Old 09-11-2019, 04:58 PM
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Actually, no. You can also pick up constant 12V at the fuse box (Cigar Lighter) or at the Lighter, itself. If you go to the fuse panel you can use a fuse tap like these....

Wait, so the cigar lighter in the mustang is a constant 12v source? even with the ignition on off it will still get 12v?
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