On Wednesday, August 5, 2015 at 12:05:59 PM UTC-5, Snuffy Hub Cap McKinney wrote:
"micky" wrote in message ...
In alt.home.repair, on Tue, 4 Aug 2015 16:38:18 -0700, "Snuffy \"Hub
Cap\" McKinney" wrote:

This just started.... or at least I just noticed it. With the headlights on dim and engine warmed up and idling, the brightness cycles from normal to slightly dim. Cycle time is around a second. When I rev the engine slightly, they return to normal steady brightness.

When running with or without lights, the ammeter is just right of center, slightly charging, in the normal position.

I don't suspect a connection -- within the last 2 months, I removed and cleaned all the battery connections, including regulator and other parts when I was fixing a grounding issue.

Battery cranks start just fine. No other indications of failing battery.

Thanks folks,

Snuffy

Do you have a tachometer? Does the RPM oscillate?

RPM is steady. Oscillating lights happens at slow idle. If I increase idle speed just a little with accelerator, lights are steady.

In my 90 Dodge van, the voltage regulator is built into the engine control computer. You haven't written what kind of vehicle you own. à²*€¿à²*

[8~{} Uncle Battery Monster