On Fri, 11 Jun 2010 23:37:45 -0400, "Steve"
wrote in :


"Frank Gilliland" wrote in message
.. .
Last week I picked up a '73 D200 Club Cab, 400/727/D60 (4.10). And
lots of rust, of course. Jillions of things to do on it, mostly
electrical cause it was used to drag a 5th wheel. But while messing
around I tried my test CB and got several pounds of noise. Changes
pitch with engine RPM. Don't know if it's the ignition module or the
external regulator. What has your experience with mopars taught you?
Scrap the retro-regulator and go with a GM/Ford alternator? I'm
installing a 130A 3G in the F-250 so I have a headstart on that one.
Or shield the ignition harness and plug wires? Or something else?


Old school rig no doubt, Frank. I've not paid much attention to the sound
system in my plymouth, well sorta I did put an in-dash look alike cd player
but I can't really hear it above 3000 rpms so it's a waste of sorts. Do you
suspect ignition or fuel pump as the source?


RFI from the fuel pump? In a '73?

Actually I think I have it pinned down to the ignition. Figured it out
by disconnecting the regulator and battery splitter box, then running
the engine off the battery.

But you do have a point. I just rebuilt the carb today and took it out
for a spin around the block. Can't hear much else but the motor (dual
exhaust, no cats, no cab insulation, weatherstripping shot, rust holes
in the floorboard, etc.). So I got a bit more work to do before I
worry about running the radio while driving.

That, and WA State just passed a cell-phone law making any hand-held
phone a primary offense. So I'm waiting to see how that's going to
play out with CB and other mic-operated 2-way users. I have a feeling
it's going be challenged in a high court..... but not by me!


Oh, and it turns out that this 400 has a 413 crank! I guess I'm gonna
hafta start looking for a 4bbl manifold, too.