H4 headlight
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Joined: May 2012
Posts: 15
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From: cape cod
H4 headlight
Does onyone know if there is a quick way to test an H4 headlight. I have power at the headlight plug but the light does not work. The bulb does not look like it is burnt out.
Stellar HDF Member
Joined: Jul 2011
Posts: 2,583
Likes: 115
From: Boston, MA
Try and start with 2a alligator clips. Put the ground to the ground prong then the other wire to another prong. Try and flick the the lo/hi beam switch to see if either lights up. Then try the other nonground prong- post your results.
Somebody smarter will tell you to just try a multimeter set on dc and look for 12the volts dc at the hi and low prongs when switched accordingly
Somebody smarter will tell you to just try a multimeter set on dc and look for 12the volts dc at the hi and low prongs when switched accordingly
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Connect the bulb across a battery to see if that works ok and if all good then you dotta look at the terminals in that connector block because often the grouind terminal get s hot and then gets all baggy and won't make a connection to the bulb.
Clean the connections and squeeze them with pliers to see if you get a light.
Clean the connections and squeeze them with pliers to see if you get a light.
Stellar HDF Member
Joined: Nov 2007
Posts: 2,121
Likes: 300
From: New Mexico-No, you don't need a passport.
I used to own an old Ducati 450 one lunger that would shake the filaments loose at the base of the bulb. A new bulb wouldn't last 4 months.
I would resolder the connections at the base of the bulb.
Then I would drill a hole in the side of the base and fill it with silicone.
They lasted a lot longer after that.
YMMV
I would resolder the connections at the base of the bulb.
Then I would drill a hole in the side of the base and fill it with silicone.
They lasted a lot longer after that.
YMMV
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