ALT Warning lamp 'still glowing'

Troy · May 11, 2008

Howdy pardners!

MY alternator warning lamp came on super bright the other day ( which surprised me cuz 90% of older rides I have owned those warning lamps never seem to work at all ) Now because of the age and looks of both the alternator and the V regulator I installed a new regulator and a 50.00 lifetime Alt....All is normal but that pesky warning lamp still glows....its faint but still on...even after spending the day driving around.

Has this ever happend to you and what should I have looked at next?

Thanks!

Troy · May 11, 2008

Woodchuck · May 11, 2008

Usually when they glow dim it's a sign of a bad diode in the ALT.

jjmurphy · May 11, 2008

Typically this happens when a part called a trio diode is defective. It is in the alternator. Go to a GOOD alternator repair shop and have them test your alternator components while individually while apart.

GrabberOrange69 · May 12, 2008

I quit buying auto part store starters and alternators long ago. Find an auto electric shop and have them fix it - you won't regret it!

My epiphany moment came years ago while struggling to replace a starter in a 5.0L mustang (my daily driver) during a downpour, for the 3rd time in as many months - sure it was "lifetime guaranteed" but I found my labor and reliability were worth more to me.

Troy · May 12, 2008

Thanks guys! I'll check it out.

LAM700 · May 12, 2008

I had a 65 do that once. The owner told me the alternator was brand new. Came from Autozone. Alt light would not go out. I removed it and took it to a local guru who rebuilds them. He had to replace the diode pack. I reinstalled it and when the engine started, the light went out. No problems since.
Hope this helps.

ALT Warning lamp 'still glowing'

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