Re: why do lights dim at idle??
Yep, as Doug suggests, the original design left a lot to be desired by today's technology.
Check fan belt tightness and adjust accordingly - 1/2-5/8 inch deflection on the longest run.
Your battery measurement of 12.3 is low, and very well may be due to low alt output as indicated, 13.4 volts.
Several things could affect this event.
Loose belt or worn belt slipping
Poor connections of red wire from alt BATT terminal to battery post - disconnect battery, clean clamps and posts, disconnect wire from alt, horn relay buss bar, battery junction block, and negative battery cable , and wire brush all terminals, reassemble.
Volt regulator needs adjustment - let an electrical shop do it, or
replace the VR with a electronic VR, Wells P/N VR715 and don't forget to use the ground strap from the original VR.
If you change out VR, save the original one.
Any questions, keep asking.
Years ago, the VR was adjusted for the driving routine of the car.
Once a week, battery level was checked visually.
If acid was low, battery was being overcharged, reduce voltage setting on VR.
If battery was dead, or low on power, adjust VR up in voltage.
This design was not for stop-go traffic and idle time.
Start the car drive it 10-15 miles at highway speeds.
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