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Old 01-11-2022, 01:21 AM   #1
hstuder
 
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Question Speakers Don't Work When Engine Running | Help Me Out

Alright so this is a fun one. 1990, king cab, rwd, 2.4, 5spd. Door speakers only, some aftermarket 4ohm Pioneers. No rear speakers. Bought the vehicle with no stereo a while back so I couldn't test it at the time of purchase. Bought and installed one of those cheap $50 CAD Jensen stereos from Amazon -- the ones with just radio, aux, bluetooth.

Turn the key to ACC, stereo powers right up and works 100%.
Turn the key to ON, stereo powers right up and works 100%.
Start the truck, key goes back to the ON position, stereo powers right up, but no sound comes from the speakers.

So that's messing with my head cause this makes no sense to me. Anyone else had a similar problem? I already tested the polarities of the aftermarket speakers, in case that was doing something weird. They move outward when powered, so they are hooked up the right way. Not sure what else to do. I assume last ditch effort is rewiring the speakers from the back of the chassis plug for the radio, all the way out the doors, to the speakers. Just don't know how that would fix it, as the speakers work fine when the truck isn't running.
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Last edited by hstuder; 01-11-2022 at 01:30 AM.
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Old 01-11-2022, 12:19 PM   #2
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That’s a pretty weird problem. My first thought is that there is something wrong with the new radio itself. Have you got an extra radio laying around that you can try? Or maybe a friend who has something.
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Old 01-11-2022, 06:10 PM   #3
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I think it's something in your wiring... or the unit itself has issues.

So, you do you have an "always hot" lead to the stereo? Is it connected to an "always hot" 12vDC source?

Look at your wiring diagram again and see if you missed anything...

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Quote:
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 01-11-2022, 06:20 PM   #4
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Thatís a pretty weird problem. My first thought is that there is something wrong with the new radio itself. Have you got an extra radio laying around that you can try? Or maybe a friend who has something.
I'm planning on testing this once I have time, tomorrow or the day after. That's my last guess at this point.
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Old 01-11-2022, 06:21 PM   #5
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I think it's something in your wiring... or the unit itself has issues.

So, you do you have an "always hot" lead to the stereo? Is it connected to an "always hot" 12vDC source?

Look at your wiring diagram again and see if you missed anything...
Yes there is a constant 12v to the radio as well as the switched/acc 12v. Both have been tested and they work.
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Old 01-11-2022, 06:22 PM   #6
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So, when you start the engine, do you get a spike or drop on the hot 12V line?

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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 01-11-2022, 06:25 PM   #7
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OH, are you using the factory speaker wiring? ...or have you run independant wires for the speakers?


edit: OK, I see you're not with the truck now. Answer what you can... we'll get to the bottom of this.


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Quote:
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 01-11-2022, 06:32 PM   #8
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When you crank the engine over, it typically kills power to the radio momentarily. Maybe that on/off/on is triggering the MUTE or something. Maybe it's trying to power up an amp.

Just for giggles, try to unmute it.


Try the Jensen website for FAQs
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Old 01-11-2022, 06:37 PM   #9
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Originally Posted by Reserector View Post
When you crank the engine over, it typically kills power to the radio momentarily. Maybe that on/off/on is triggering the MUTE or something. Maybe it's trying to power up an amp.

Just for giggles, try to unmute it.


Try the Jensen website for FAQs
This is where I'm going with my TS. I wonder if it's killing the amp.

But I also wonder if the speaker wiring is solid... or tied to something else.


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Quote:
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 01-11-2022, 06:39 PM   #10
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Quote:
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... or tied to something else.
...like an amp?
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