Pulsing headlights

Hey guys im back already . Just a quick one this time. For some reason my lights inside and out pulse. Even when I am going down the road at speed. My alternator is charging fine I tested that tonight. Could it maybe be my belts?? They are pretty cracked looking like they need replaced.

this is almost always a voltage regulator problem. Regulator is in the alternator.

Who tested the alternator, what did they tes, and how was the test conducted? Test will come out different at home with an ammeter versus in a shop that has variable load equipment that's used, and different still depending on other factors.

Do tell.

Albertj

Well I had the genisys hooked up to it. It said it was doing 14.0 or something like that. I didnt do a full test on it I suppose. I just saw it was charging

If it's a fairly fast pulse, a digital meter often won't show it... you'll just get the average voltage. It could be the regulator, but it could also be the rectifier diodes.

Either way, only an old analog meter would probably show it, but you can do one more test if you have a multimeter: Connect the meter to the battery or the jump-start connector, and then check both DC voltage and AC voltage... A DMM with the horizontal bar at the bottom might show meandering voltage on the DC, and if you have any AC, then the rectifier is shot.

In addition to the voltage regulator, it COULD be bad/rusty grounds, loose cables on the alternator or battery... Make sure the engine ground strap is present and well connected, it should be above the starter on a trans bellhousing bolt to the body close by.

Thanx again guys...ive asked so much in a short time lol