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groundhogy's avatar
groundhogy
Explorer
Aug 02, 2021

After towing RV with bad batteries, truck blinkers...

... and brake lights doing weird stuff. Turn signals act like a light is burned out. They blink real fast. Both sides. Sometimes they blink a little slower, then pick up speed. If blinker is on...
groundhogy's avatar
groundhogy
Explorer
Aug 05, 2021
Brake controller removal did not change anything.

CLUE: So I pulled the tail light and had the bulb out to observe.

It is a dual filament bulb. Top filament for blinkers and stop. Bottom filament for nighttime tail lights.

When you turn on the turn signal the blinker speed is normal, you correctly see the top filament blinking.
But then you see the bottom filament start to light up . And the blink speed goes up.

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