RADIO AND HEATER

[grandads59]

My new rear speaker came with a black wire which I assume is for the ground.   My old one had nothing (didn't work).
Modes this just ground to one of the speaker screws.

Jon Hartwell

[Doug Houston]

Try grounding the speaker voice coil to tthe body, as the other one was.

For any (unexplainable) reason, you have generator or alternator noise in the new speaker, run a grounding wire from the speaker voice coil to the radio case, instead of to the body.

I'm confident that   the body ground will do the job.

[59-in-pieces]

Jon,
Your car is a coupe - can't answer directly.
I only know Eldos convrts - but they are likely alike..
And, it sounds like you have an after market speaker - does it look like the pics.

There is a pic of a rear speaker cut from a major rusty Eldo - note the ground location.
There is a pic of the replacement speaker with both leads.
Note there are 2 wires - one for the lead to the radio, and the second is the GREEN ground.
I reinstalled the speaker assembly like original - ground wire to the rear seat frame - works like a champ.

Have you checked the continuity from rear to the front along with the splitter knob - may be a simple broken wire.

Have fun,
Steve B.