Thank you, this just helped me out.

 

I had a similar problem, the issue was a little gear on the inside of the cassette. Works fine now.

https://www.instructables.com/id/How...otauto-revers/

 

I was having the problem with the tape not ejected. I went in and replaced belt/band which fixed that problem. Tape now goes in and comes out as it should.
BUT
now tapes won’t play. I messed something up but can’t figure out what.
I opened it up and watched it. The gears to turn the tape don’t move but the rods near the tape are spinning and sound like they are clicking on in and out of fast forward.

 

What year is it again???

 

It’s a 1996

 

Im having issues where my cassette player doesn't even work. I insert the cassette and it won't take it in, even if I push it all the way in with my fingers, kinda just sits outside the cassette player. Any ideas how I can fix this??

 

These trucks are 25 years old fellas. The cassette player is likely gooed up wit dust and other gooey things that prevent it from working. They could be warped on the inside. The haven't been oiled. The electronics are shot. Take it out and inspect it and maybe some alcohol swabs to clean.

Don't be surprised if your tape goes in and doesn't come out or comes out with the tape stringing all over the place.

 

I am in the middle of trying to fix my OEM cassette player. Thought about getting a new unit, but to be honest, I'd like to continue playing my cassettes. A couple of questions:

1. Does anyone know of a modern head unit with a cassette player for the D1? Or even an aftermarket unit that you recommend?
2. If I install an aftermarket unit, do I lose function of the dash buttons (volume, mode) and the CD player?

 

ditch the cassette. If your CD player powers up, all you need to do....
1. snip the audio wires (Left +,- & Right +,-),
2. add a female RCA to the wires going to the head unit,
3. install a Bluetooth adapter such as https://a.co/d/02iM76Y5 which can be installed behind the window switches (there is a ton of room under there) or under the passenger seat on top of the CD player,
4. tap power from the cigarette lighter or the CD

listen to perfect digital music streamed from your phone.

The main cable between the factory head unit and the CD player has 13 wires in it (plus a ground). Using the diagram we see that pins 1,2,3 & 4 carry the audio signals.
1. Left channel ground
2. Left channel positive signal
3. Right channel ground
4. Right channel positive signal

Put the female RCA connection along wires 1,2,3, & 4 to accept the bluetooth module output and fool the factory head unit into thinking it is playing a CD when, in fact, the audio is coming from our new inputs.

The other 9 of the 13 wires carry control codes so I just put jumpers in between them so the CD and head unit can continue to ‘talk’ to each other.

Finally there is the ground which again can simply be re-connected.

Below is the key for figuring out which wire inside the main cable goes to which pin.

Inside the main cable there are two grey, a blue, and a red wire as well as an unshielded ground. The grey wires and the blue wire have wires inside them so in reality you have three ‘layers’ of wire.