Quote:
Originally Posted by PurpleTurbo
I do yes
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Whip the bulbs out, set your meter on the 0-200 resistance range, hold one probe on the metal body of the bulb and then touch the other probe to each of the terminals on the base of the bulb in turn.
One should give ~25 Ohms, the other should give ~6.7 Ohms (this is the 21W filament i.e. brake light) then repeat for the other bulb.
I suspect one or other of the filaments in both bulbs is defective.
Once you've proved the bulbs are dead or alive, fit working bulbs to the bulbholder and after you've located the common earth terminal (it's the one that mates with the long strip on the back of the cluster running top to bottom) connect one probe to that and then touch the other two terminals in turn, looking again for the same readings as the bare bulb.