I did not install these. And since this truck was probably not driven during darkness very little or even at all, I doubt the prior owner ever noticed the flashing issue. When illuminated, these bulbs, certainly do not look brighter to me than an ordinary lamp.
As mentioned before, they flash on both low and high beams. My new headlight switch arrives today, so after trying that, if I still have a problem, I will look into a "stock" type of bulb as a test.
I cannot believe there are no identification markings on these headlight bulbs to determine mfg, voltage, type, etc.
Thanks for your reply.
