#1: Wiring headlight issue. Author: jimjam19927, Location: PortsmouthPosted: Mon Jul 16, 2012 7:24 am ---- Had a multimeter out and the passenger side dipped beam bulb in my morrettes has dropped to 6v? any ideas why this could be? bulbs work fine its definately the v drop which is causing my issue.
It was fine then the volts just dropped? Would it be worth removing the headlight and then rewiring and fitting them?
How did you get the 6v - probes on the terminals that attach to the bulb?
If you measure between the [supposed] +12V feed and known good ground (like battery pole, as well as between the ground lead in the bulb connector and a known good you might be able to figure out if the problem is on the +12V feed or on the ground side...
You want 12V (~14 w/ engine running) on the feed and as close to 0 as possible on the ground (do the checks w/ light on, as the very low current from a multimeter most likely wouldn't cause much of a voltage drop over a bad connection of itself)
It was fine then the volts just dropped? Would it be worth removing the headlight and then rewiring and fitting them?
How did you get the 6v - probes on the terminals that attach to the bulb?
If you measure between the [supposed] +12V feed and known good ground (like battery pole, as well as between the ground lead in the bulb connector and a known good you might be able to figure out if the problem is on the +12V feed or on the ground side...
You want 12V (~14 w/ engine running) on the feed and as close to 0 as possible on the ground (do the checks w/ light on, as the very low current from a multimeter most likely wouldn't cause much of a voltage drop over a bad connection of itself)
Thanks will give this a shot. All the other bulbs are working fine and functions proper like flashing etc.
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