The "normal" reason they flash is thermal overload on the switch. The common reason for that is higher resistance from either a failed bulb, or one of the bulb grounds fails and you get the same basic result.
Easy testing, connect a spare high beam lamp up to a couple test wires. Connect one wire to battery positive. Unplug each low beam. Now connect the "test light" to the ground terminal in each of the bulb sockets (black wire) If the grounds are good the bulb should light up real bright. (Each side has its own ground)
Another test, use a welding lens to look inside the bulbs with the high beams on. You should see only one filament lit in the low beams.
Also, check the light green wire (high beam power) for any damage or bad connections.
The issue should be between the dimmer switch and the lights.
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Tuesday, September 19th, 2017 AT 11:58 PM
