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post #1 of 16 (permalink) Old 04-19-2019, 11:05 PM Thread Starter
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New radio issues

So, I installed a aftermarket radio in my 91 thunderbird sport, I removed the factory radio and spliced the new headunit to a aftermarket harness that plugs directly into the factory plugs. The radio worked great, no issues, untill after about 5 uses, I turned the radio up a little further in volume and everything sudden stopped working. I checked the radio fuse under the dash and the one in the back of the head unit, I re spliced the connections and even tried a different head unit, with no luck. Unfortunately the factory radio was damaged in removal (thanks Ford security) and I can't use the old radio to test. I'm unsure what else to do, not sure if anyone has any advice, or knows what could have happened? Is there any other fuses that effect the radio operation?
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post #2 of 16 (permalink) Old 04-19-2019, 11:38 PM
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Is the new radio under warranty? If it’s not the fuses I’d suspect it and get it replaced, it sounds like something in it failed, not the car. How did you destroy the old one? The security tabs are on the sides, damaging those shouldn’t impede operation to verify?

Which stereo did your car come with originally? Eg Regular Stereo, Premium sound or JBL? The latter two have separate amplifiers that you need to bypass when installing an aftermarket Headunit.

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post #3 of 16 (permalink) Old 04-19-2019, 11:57 PM Thread Starter
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Long story I crack led the faceplate while removing, this is what it looked like
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post #4 of 16 (permalink) Old 04-19-2019, 11:58 PM Thread Starter
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I tried a different aftermarket head unit as well, I don't think it is the head unit
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post #5 of 16 (permalink) Old 04-20-2019, 02:15 AM
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So you tried a different head already and it won't work either? Do they power up at all?
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post #6 of 16 (permalink) Old 04-20-2019, 03:35 AM
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Sounds to me like you blew the 20w speakers, or the finals in the radio.

A 9v battery, applied to the speaker leads will make a popping noise; give that a shot and report back.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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post #7 of 16 (permalink) Old 04-20-2019, 11:14 AM Thread Starter
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They don't power up at all, would the speakers being blown cause no power at all?
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post #8 of 16 (permalink) Old 04-20-2019, 11:31 AM
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The stock wiring on my Cougar was very short. Had the same issue. Found I had no constant power. Check both power sources for juice. You need both constant and ignition power for the unit to work in my experience
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post #9 of 16 (permalink) Old 04-20-2019, 11:32 AM
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Also check the constant voltage fuse - for a 1991, that should be the 5A MEMORY fuse in the power distribution box (by the battery). Most after markets actually use that for power; they use the switched line to control power internally.

If that's what's blown, you CAN try dropping a 7A or so fuse in; I'd suggest instead running a clean line into the engine bay with its own fuse just for the radio.

RwP
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post #10 of 16 (permalink) Old 04-20-2019, 01:21 PM Thread Starter
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Quote:
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Also check the constant voltage fuse - for a 1991, that should be the 5A MEMORY fuse in the power distribution box (by the battery). Most after markets actually use that for power; they use the switched line to control power internally.

If that's what's blown, you CAN try dropping a 7A or so fuse in; I'd suggest instead running a clean line into the engine bay with its own fuse just for the radio.

RwP
It was the memory fuse, thank you! Probably gonna run that additional power lead, do I need to just run it directly to the red power lead off my radio?
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post #11 of 16 (permalink) Old 04-21-2019, 03:00 AM
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It was the memory fuse, thank you! Probably gonna run that additional power lead, do I need to just run it directly to the red power lead off my radio?
Yep, that's how I'd do it.

(So far my MEM fuse is liking my "60W PER CHANNEL QUAD OUTPUT!!!" head unit *grins* )

RwP
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post #12 of 16 (permalink) Old 04-21-2019, 02:32 PM
No, Mr. Lemmywinks, No!!!

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Without a switching power supply, the best you can get from 14.4V is about 36W at about 5% distortion.

That's with a bridged amp...



The Pyle amp I rebuilt has 120V rails, lol. (56A @14.4V, at about 1% distortion, mostly crossover distortion)

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #13 of 16 (permalink) Old 04-21-2019, 06:33 PM
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*dry* You DO notice it's in quotes, right?

That 60W is probably some weird variant of Peak Music Power Output.

You know that "150W PER CHANNEL PMPO" on a set of speakers run off of four AA batteries.

RwP

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post #14 of 16 (permalink) Old 04-21-2019, 08:18 PM
No, Mr. Lemmywinks, No!!!

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I know, Ralph; it's just funny to see the claims.
You know what I'm talking about.



If it has a 10 awg power wire, it might make 60W/ch.
Probably not, unless it's alpine or something, lol.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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Truth Isn't Truth. - Rudy Giuliani, 2018 Award winner, “Most Outrageous Diversion” by MSNBC for this quote
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post #15 of 16 (permalink) Old 04-21-2019, 08:29 PM
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I know, Ralph; it's just funny to see the claims.
You know what I'm talking about.



If it has a 10 awg power wire, it might make 60W/ch.
Probably not, unless it's alpine or something, lol.
It's not an Alpine.

*dry* I think I'm pretty safe, especially since Sweetie doesn't like it all that loud in there.

RwP

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post #16 of 16 (permalink) Old 05-06-2019, 01:18 AM
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Glad you got it figured out. I've had the same issues with my Fords. Trying to figure out some other things with my vehicles. It's been a long time since I've seen one of those stereos. About 13 vehicles and 20+ stereos ago. I just have amps and a box of random electronics. It's like a flea market around here anymore.

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