OK, where is the stock OE 74 620 radio speaker?

[Cardinal Grammeter]

I've got the 2 post connectors coming from the radio and no clue where the speaker is supposed to be - no obvious speaker grille in the dash, so....?

 

The factory shop manual has no information on the speaker.  (at least I couldn't find anything)

[sebpv]

Have you used google much recently...?

[5t341tH]

left and right kick panels

[datzenmike]

Both kick panels have cut outs for small speaker mounting. A single speaker is offered up to '74 and single and dual speakers after with the newer AM/FM mono and AM/FM multiplex radios.

[Cardinal Grammeter]

I found the round cutouts in the kick panel body metal, however the upholstered kick panels are solid w/o speaker holes or grilles.

 

So I guess this truck never had a radio originally.  There is a radio in it so I guess someone put it in and never finished the job.

 

I suppose there is a speaker wiring harness too.

 

The radio has two wires (male and female) post connectors.  Are the L and R w/ground returns or + and - for a single speaker (or two in parallel?)

 

If there is a single speaker, is it in one kick panel only?  (which one?)

[datzenmike]

All good questions.

 

If two wires then that's it for one speaker. Polarity doesn't matter much for mono.

 

One speaker can only go in one panel..... I would suggest the passenger side.

[Cardinal Grammeter]

MYSTERY:  Why do I have a radio and no speaker holes (or speakers for that matter) in the kickpanels?

 

THEORY:

 

The cab was originally that great blue color but they painted it red.

 

It has black kick and door panels and a dark blue mat.

 

I believe they found a black interior doner with a bad mat and kept the blue one since it is flawless.

 

But I'll bet the black doner didn't have a radio!

 

Anyhow, that is my theory.

[datzenmike]

I think the kick panels were cut so they could be punched out and the speaker option added. Take a look on the inside, maybe the front is painted over. The back should be perforated in a small speaker shape and room for 4 screws.

[Cardinal Grammeter]

I just put my interior back in and both of my kick panels have small about 1" holes in them about 4-6" up from the floor.

 

If I look closely, it looks like something round of greater diameter impressed the black vinyl on them.  (If it was in the door, you'd think it was the escutcheon of a window crank.)

 

I have no idea why they are there.

 

I wonder if someone installed small tweeters and the grille's imprinted the vinyl?

[datsunaholic]

Original 620 kick panels were NOT upholstered.  Just painted fiberboard, and the speaker popouts (as well as the holes for the door hinge access with plastic/rubber heart-shaped plugs) were obvious.