Hello all. Need help. As of lately, my cabin and door light started pulsating. Now my head lights are doing it to a degree. I thought it might be a bad battery or alternator. I swapped the battery for a new one ( it was free that's why I did it) but the pulsating is still there. Could it be my alternator? Any other suggestions would be great. Thanks

Voltage regulator in the alternator is probably about to sh*t the bed. Alternator probably needs to be replaced.

Check for any leaks at the PS pump before you replace the alternator. If there's a leak, save yourself some headache later, and fix it at the same time.

A volt meter would help you here......But yes your alternator may be on its last leg.

Before going through the trouble of replacing your alternator, do yourself a favor and make sure ALL grounds are solid and clean.

This. /|\

GROUNDS!!!

There is only one onto the body off the battery cable. Do that one. It should be tapped out (shiny) and load it with anti sieze.

been there and had the same.

Rich