Stereo works on workbench but not in car

[phantombox]

Hi guys.
I have an old analogue car stereo that works if I connect it to a 13.75 VDC PSU, but when I mount it into my car it wont. The voltage between power in and ground at the radio drops to zero.
What am I doing wrong? Am I missing something?

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[ThxOne Premium Member]

Well, we don't know the car so it is hard to say. Sounds like no power or ground. Use the cars battery and hook it directly to the cars battery. If it works then you will need to know exactly the correct radio wires to use behind the dash, if it doesn't work... is your battery charged?

 

[phantombox]

Its a Toyota Samurai '84. I just charged the battery. When testing the +12V and ground point where I want to connect the stereo it measures, well, +12V. But when I install the stereo then the voltage drops to zero.

 

[ThxOne Premium Member]

Its a Toyota Samurai '84. I just charged the battery. When testing the +12V and ground point where I want to connect the stereo it measures, well, +12V. But when I install the stereo then the voltage drops to zero.

Pull the radio, connect the power +12v and ground where you want to connect them. Now wiggle the +12v wire in the dash and at the radio. See if it drops power. Do the same for the ground.

What kind of radio is this??? Aftermarket? Yellow, Red and Black wires?

 

[phantombox]

"What kind of radio is this??? Aftermarket? Yellow, Red and Black wires?"

It's a NIPPON AMERICA, K (something something) 750QR, auto reverse cassette player, AM/FM MPX Stereo radio with digital display. It's quite out of date, but with a dedicated CD input.
Yellow, red and black wires.

 

[jrouter76 10+ year member]

"What kind of radio is this??? Aftermarket? Yellow, Red and Black wires?"

It's a NIPPON AMERICA, K (something something) 750QR, auto reverse cassette player, AM/FM MPX Stereo radio with digital display. It's quite out of date, but with a dedicated CD input.
Yellow, red and black wires.

If THX0ne suggestion does not solve the problem, run the power(red) and (yellow) wire together to a fuse in the fusebox that`s Hot(on) constantly and Ground the Black wire to a known ground-wire or grounding point on the car...this will telll if there is a wiring harness problem in the Dash

 

[Bobbytwonames 5,000+ posts]

I thought Suzuki made the Samurai. Any pics of the vehicle?

 

[phantombox]

If THX0ne suggestion does not solve the problem, run the power(red) and (yellow) wire together to a fuse in the fusebox that`s Hot(on) constantly and Ground the Black wire to a known ground-wire or grounding point on the car...this will telll if there is a wiring harness problem in the Dash

Ok my workbench, I only have to connect the red for +12V and the black to ground. Yellow, I believe, it an auxiliary output for a the electric antenna or an amp.

Suzuki also made a vehicle called Samurai, but it's about have the size of the Toyota. You con Google it: Toyota FJ-60.

 

[jrouter76 10+ year member]

Ok my workbench, I only have to connect the red for +12V and the black to ground. Yellow, I believe, it an auxiliary output for a the electric antenna or an amp.

Suzuki also made a vehicle called Samurai, but it's about have the size of the Toyota. You con Google it: Toyota FJ-60.

so which wire is for Memory on your HU if yellow is for remote or Ant.