| 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
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