head lights pulse after bypassing my bulkhead

I had a similar problem, all lights were pulsing, changed VR and Alt, cleaned the grounds, took VR mount off remounted with star washers, still pulsed, I just put a Barracuda dash in the car, so I went through all that wiring, the bulk head was cleaned up well before reinstalling, found nothing wrong, took alt in to get checked, nothing wrong with it, they told me it sounded like a bad ground or a bulb!! Grounds were already checked by then so started looking at bulbs, one bulb in the grille had one of the locater tits broke off on the base, replaced it, problem solved. Never heard of that happening before. Don"t know if that's your problem, worth a look.