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Power for aftermarket stereo
#1
Can I get power to my aftermarket stereo thru the factory radio plug? The factory plug is a dual female plug. It has two white/pink wires and one blue/red wire. If I can, do I just use the plug with the white/pink wire or do I have to use both the white/pink and the blue/red?  Ryan    

1973 Mach 1, Porsche Guards Red, 429/C6
1972 Mach 1, Grabber Blue, 302/C4, currently under construction
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#2
IIRC, one is for power in ON and ACC, the other is radio illumination. Probe the connector with a test lamp to figure out which is which.


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#3
Light blue with red stripe is illumination.
White with pink is power.

Shane

Adelaide

73 Mach 1
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#4
I know this post is kind of old but, depending on what aftermarket head unit you bought, it may be pulling more amps than the old wiring/fuse was rated for. this is always true when installing an aftermarket amplifier. also, don't reuse the factory ground wire for an aftermarket head unit with bluetooth. if you do, I can almost promise you that the bluetooth will pick up your engine noise...it does sound like a supercharger when this happens, but you will not go faster. find a better ground than the one used in the old factory head unit.
[+] 1 user Likes MustangNJ's post
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#5
(08-07-2019, 01:41 PM)MustangNJ Wrote: I know this post is kind of old but, depending on what aftermarket head unit you bought, it may be pulling more amps than the old wiring/fuse was rated for.  this is always true when installing an aftermarket amplifier. also, don't reuse the factory ground wire for an aftermarket head unit with bluetooth. if you do, I can almost promise you that the bluetooth will pick up your engine noise...it does sound like a supercharger when this happens, but you will not go faster.  find a better ground than the one used in the old factory head unit.

My '82 Mustang used to make that noise when the stator in the alternator let go - high pitched buzzing through the speakers that used to rise and fall with the rpms.  I think Autozone gave me something like 3 alternators in the 2.5 years I owned the car - gotta love lifetime warranty.  LOL!

I went with a Retrosound Model 2 head unit in my '71, which is not drawing any more juice than the factory Philco AM/FM radio that came with it.  I did use the factory radio power lead, mostly because it had already been cut by the previous owner when they swapped in some aftermarket radio back in the '70s.  I did have to run a separate wire for the always hot memory power lead - maybe it distributes some of the power load to be drawn through that lead in addition to simple keyed power.  I think the ground wire is the factory ground as well - I only mentioned because the Model 2 is hands-free via BT, and I haven't heard a single 'out-of-place' noise through the speakers when using the phone.

For the 400 watt 2-channel amp for the subs, I ran a complete new circuit to the new fuse block I made for the aftermarket things I've added (I'm also a believer in not cutting into the factory harness any more than necessary).

Eric

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#6
I left the factory head unit in place and installed an 800w 5 channel amp. I'm running 2 rear 6x9's and a 12 sub. I use the RCA inputs to the amp to plug directly into my iPhone. I intend to install front speakers at some point once I figure out where to put them, and that is when I may install a head unit because I will need fader control. I may be able to get around this using the gain control to amp1 and amp2 on the amp, right now I'm running a bridged connection
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#7
(07-07-2019, 07:54 PM)73429mach Wrote: Can I get power to my aftermarket stereo thru the factory radio plug? The factory plug is a dual female plug. It has two white/pink wires and one blue/red wire. If I can, do I just use the plug with the white/pink wire or do I have to use both the white/pink and the blue/red?  Ryan
Hi
i read the responses but didn’t understand...do you put a bullit plug with the new radio harness’ (constant) yellow wire and (Acc) red wire together in the female plug, leaving the light blue open? Your pic has the same female plug I have...so not sure what plugs into that or those openings
thanks!
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#8
(09-19-2019, 04:43 PM)Rmach1 Wrote:
(07-07-2019, 07:54 PM)73429mach Wrote: Can I get power to my aftermarket stereo thru the factory radio plug? The factory plug is a dual female plug. It has two white/pink wires and one blue/red wire. If I can, do I just use the plug with the white/pink wire or do I have to use both the white/pink and the blue/red?  Ryan
Hi
i read the responses but didn’t understand...do you put a bullit plug with the new radio harness’ (constant) yellow wire and (Acc) red wire together in the female plug, leaving the light blue open? Your pic has the same female plug I have...so not sure what plugs into that or those openings
thanks!
Basically correct.  The white/purple lines are fused ACC power and can be used for radio power; the blue/red wires are for dash lamps and is typically not used in aftermarket radios.  You'll need to tap into a BATT fused line for any memory power lines; the cigarette lighter is nearby, handy and available to be tapped into.

Let me check your shorts!
http://midlifeharness.com

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#9
(09-19-2019, 07:00 PM)midlife Wrote:
(09-19-2019, 04:43 PM)Rmach1 Wrote:
(07-07-2019, 07:54 PM)73429mach Wrote: Can I get power to my aftermarket stereo thru the factory radio plug? The factory plug is a dual female plug. It has two white/pink wires and one blue/red wire. If I can, do I just use the plug with the white/pink wire or do I have to use both the white/pink and the blue/red?  Ryan
Hi
i read the responses but didn’t understand...do you put a bullit plug with the new radio harness’ (constant) yellow wire and (Acc) red wire together in the female plug, leaving the light blue open? Your pic has the same female plug I have...so not sure what plugs into that or those openings
thanks!
Basically correct.  The white/purple lines are fused ACC power and can be used for radio power; the blue/red wires are for dash lamps and is typically not used in aftermarket radios.  You'll need to tap into a BATT fused line for any memory power lines; the cigarette lighter is nearby, handy and available to be tapped into.
Thanks midlife!!!
i have your handywork throughout my car, cluster harness, all harnesses restored, gauge harness...!!!  This really helps!
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#10
(09-19-2019, 07:00 PM)midlife Wrote:
(09-19-2019, 04:43 PM)Rmach1 Wrote:
(07-07-2019, 07:54 PM)73429mach Wrote: Can I get power to my aftermarket stereo thru the factory radio plug? The factory plug is a dual female plug. It has two white/pink wires and one blue/red wire. If I can, do I just use the plug with the white/pink wire or do I have to use both the white/pink and the blue/red?  Ryan
Hi
i read the responses but didn’t understand...do you put a bullit plug with the new radio harness’ (constant) yellow wire and (Acc) red wire together in the female plug, leaving the light blue open? Your pic has the same female plug I have...so not sure what plugs into that or those openings
thanks!
Basically correct.  The white/purple lines are fused ACC power and can be used for radio power; the blue/red wires are for dash lamps and is typically not used in aftermarket radios.  You'll need to tap into a BATT fused line for any memory power lines; the cigarette lighter is nearby, handy and available to be tapped into.
Hi again
the cigarette lighter (new part) didn’t work ( get hot) and I’m not able to get a reading on the little elbow plug so is there a better way to test it for power? Should I scrape it out maybe?The female spade end does have a reading on the meter....I’d like to use a tap splice to pickup power for the orange lead for memory... I have to use a larger bullit male plug on the aftermarket radio harness so it’ll engage the OEM (yellow) wire female plug. Thanks again for any advice!!
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