high beam indicator light

dagenham

Member
May 23, 2010
100
3
19
Duncannon PA
The little red dot for the high beam indicator in my '66 mustang is always on when the headlights are on. It gets brighter when I turn the lights up on high beam but when I turn the lights down on low beam the indicator light is still lit but dimmer.
Could I have a problem with my headlight switch or could it be something else??
Has anyone else ever had a problem like this??
 
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on the 69's, there is something like a foam gasket that is supposed to shield the light from the other light bulbs from leaking through. When I rebuilt my cluster, that stuff crumbled away and now there is always a little bit of light that lights up mine( as well as the turn signal indicators)

The fact that yours gets brighter when you flip the switch, and dimmer when you turn it off, makes me think everything is working fine, however the indicator is just getting lit by light leaking though.
 
When I unplug both headlight bulbs the indicator light works properly. But even with just one bulb plugged in(and it doesnt matter which one) the light stays on either way.

Does anyone know which wire is wich on the plugs for the headlight pigtail?? I am thinking that I may have crossed a wire when I put new pigtails on the headlight harness . The shop manual does not show what color does what or goes to which terminal on the connectors.
 
dagenham,
It sounds as though you may be on to something. I'm not sure of the "pin-out" configuration, but you should be able to figure it out with a bulb and a multi-meter/continuity tester. For each circuit of the bulb to work "correctly" it need a positive and a ground/negative and the ground is shared by both the high and low beam circuits. For process of elimination, I'm pretty sure that the blade that goes across is the high circuit and the 2 blades that are parallel to each other are the low pin and the other is the ground, just not sure which is which. The one that gives continuity to the high blade should be the ground/negative and the other should be the low beam positive. When you determine which is supposed to be ground, test all and make sure that the ground is well connected to a good clean ground point.
HTH,
Gene
 
Does anyone know which wire is wich on the plugs for the headlight pigtail?? I am thinking that I may have crossed a wire when I put new pigtails on the headlight harness . The shop manual does not show what color does what or goes to which terminal on the connectors.
66instr.jpg
 
Well, I figured it out. When I replaced the pigtails on the headlights I matched colors but they did not match the wiring correctly. After I changed the pins in the socket yesterday everything works properly now.