Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

1966 mustang headlight

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Old Jan 2, 2011 | 11:58 PM
  #1  
dcohen's Avatar
dcohen
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Default 1966 mustang headlight

which prong on the actual bulb is for the hi-beam, low beam, and ground? (top, left, right?) or does it even matter?
Old Jan 3, 2011 | 04:16 PM
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anybody?
Old Jan 3, 2011 | 07:48 PM
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yes it matters. just use a test light to see were the power is.
Old Jan 4, 2011 | 05:52 AM
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it does matter alright, however I have no idea which one is wich. can't you compare it to the other side?
if not you can find out with an ohm meter and testing. measure resistance between the prongs (try all three combination). Only one combination will give you infinite resistance if the bulb is good. this will only happen when you measure from high beam to low beam, which means the one you are not testing is ground.
Then just put 12V on one socket and minus on the ground socket and see what lights up (high or low).

I haven't checked on the following, but that should work:
http://www.carhidkits.com/myfiles/image/H4_Pinout.jpg

(common in this chart being ground). H4 and sealed beams have the same pin layout since I converted without having to change anything
Old Jan 4, 2011 | 09:13 PM
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dcohen
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i know which wire is for the high and low beam i just need to know which prong each wire goes to. Kalli, what you said makes sense and should work. I will try it tomorrow
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