My '66 F350 dually has an amp guage that pulses with about the same tempo as a turn signal. When I turn on the headlights, they dim when the guage pulses. I have recently replaced the alternator & the voltage regulator. Any Ideas??

 

My 64 does that also but only at idle, I think its the voltage regulator working.

 

When you push the accelerator pedal does it steady and charge?

 

Flickering (pulsing) amp gauges with generator or alternator is common on these trucks when idling.

 

It does it if the engine is running at any speed. The weird thing is that the headlights also pulse by dimming at each pulse. The oncoming traffic seems to think I am trying to warn them of a radar trap, as I get the "high sign" from them. I could go along with the "common occurence on '66 trucks" but not the headlight problem!!

 

Bad regulator. I had one do the same thing on a '76.

 

I replaced it once, but I will check it out...Thanks!!

 

Get your battery tested, or charge it overnight and check the gauge again with your lights and heater on.

 

The Amp Gauge uses a separate harness. This harness starts out on the inner apron at a phenolic block and runs 100 percent of the power through the loop on the back of the gauge then back out to the truck harness (basically it interrupts the stock harness and makes a long trip).

Check the mount and the cables for corrosion. No amounts of parts throwing at it will fix the bad wiring.

Garbz

 

Thanks, guys... The battery check out OK, but I will check the wiring & ground. There are not many more parts to throw at it....