[TR] TR4 radio

[Bob Labuz]

Ok here is a question for all you electrical physics types.


I hooked up my TR4 AM radio Saturday.

It is an original AM + ground model with single speaker.

The radio was recently repaired and works just fine.

I hooked up the - wire to the same wire (green) that goes to the heater. 

I made a "Y" since both connections were very close and only hot when the 
ignition is on.

After hooking everything up, I noticed that the volume was not what I 
expected.


Thinking my garage was killing the signal, I started up the car, backed up and 
noticed when I reved the engine the volume went very loud... so loud I had to 
turn the volume down.

Now when the car is at idle, the volume is very low but when I rev the engine 
(over 1000RPM) so the ammeter shows no discharge, the volume is just 
wonderful.

Yesterday while crusing around, I was able to listen on 1/2 volume with the 
top down at 55 MPH.

But come to a light and with engine at idle, much less volume.

Now I do have an electric fuel pump but that is about it as far as extra load 
on the system.

Is the drop in overall voltage causing this problem?

Is there a fix other than adjusting the idle to over 1000 RPM?

The battery is a new Exide Orbital that turns the engine over just great with 
an original Lucas starter.

The generator keeps the battery charged. I never see the ignition warning 
light come on unless the engine is stopped.

It looks to me that the charging circuit is working just fine  as I see no 
differences in the ammeter action as compared to my 3.

One other thing, the engine on the 4 seems to idle very well at about 650 RPM. 
I cannot get the 3 to idle this low, must be the newer components in the 4.

Bob