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how to check a h4 light bulb with an ohm meter

11-21-2005, 05:53 PM
greetings, fellows..
just realized today while driving on the road and one of my h4 light bulbs doesn't work in Low beam, but okay in High.
so i just pulled it out and didn't bother much to check my car wiring, because it is too dark to see anything right now.

for some reason i have an ohm meter in my house so i tried to play with it.
so....where do i check for continuity? there are 3 terminals at the end. i believe that the housing itself is grounded to car.

i had one lead of the meter on the housing, and the other touching 3 terminals-- one at a time, but shows no continuity!! howcome? the High works, but not the Low.???


11-21-2005, 07:36 PM
One of the leads will be common to both high and low. Should be able to see connections and if filament is broken,

11-24-2005, 11:27 AM
it seems your bulb has a case of Blown-Filamentous Low-Beamous.... put it out of its misery and buy a new bulb.. (the low beam filament is blown, replace the bulb)

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