Aftermarket head unit troubleshoot (1 Viewer)

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Jan 30, 2020
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67
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CA
I installed a Sony aftermarket head unit in my 80 around January of this year. All was fine until my alternator failed and I had to jump my car (multiple times). One of those times may have blown my radio fuse(s) with improper jump connections. I have since replaced the 15a radio/dash fuse that were blown and I also replaced the fuse on my head unit that was also blown. Reconnected the headunit and no response.

I plugged in the stock radio and it fires up fine, so now my attention is at the wiring harness and the head unit itself. I checked every wire in the wiring harness using my multimeter to check if there was any breakage or if I did a s***ty soldering job - all wires have a solid connection. I checked the red power wire when the car started on the wiring harness and that also came back fine.

So I thought perhaps my headunit was just fried - so I bought a new one. Connected it...then nothing.

This is where I'm stuck. What else can I check to diagnose the issue? Not an electrical expert so there has to be something I'm missing.

x-posting for more visibility.
 

MoJ

Proven source of misinformation
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I installed a Sony aftermarket head unit in my 80 around January of this year. All was fine until my alternator failed and I had to jump my car (multiple times). One of those times may have blown my radio fuse(s) with improper jump connections. I have since replaced the 15a radio/dash fuse that were blown and I also replaced the fuse on my head unit that was also blown. Reconnected the headunit and no response.

I plugged in the stock radio and it fires up fine, so now my attention is at the wiring harness and the head unit itself. I checked every wire in the wiring harness using my multimeter to check if there was any breakage or if I did a s***ty soldering job - all wires have a solid connection. I checked the red power wire when the car started on the wiring harness and that also came back fine.

So I thought perhaps my headunit was just fried - so I bought a new one. Connected it...then nothing.

This is where I'm stuck. What else can I check to diagnose the issue? Not an electrical expert so there has to be something I'm missing.

x-posting for more visibility.
Does the head unit work when you power it directly from the battery?
 
Joined
Jan 30, 2020
Messages
67
Location
CA
Fuse blows on the HU when testing. I must have a short somewhere...
 

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