:confused: My friend has a 67 nova SS that has a problem.His low and high beam was working fine and then the high beam quit working.He has changed the (done first)the headlight switch then (done second)the demmer switch w/ no cure to the problem.the low beam still works but when you click to high beam,it goes out. anyone know where to look next?Thanks

maybe the headlight is burned out ???

The problem is when he pushes the demmer switch to high beam,both lights go out.Its possible that both high sides are burned out but I dought it.If both sides are out,then maybe a possitive wire that feeds the high beam grounded somewhere on the high side and burned them out?

i'm not much of an electrician, sorry. i was hoping you didn't take my reply as smart-alleck... it was an attempt at helping ;)

maybe this can be of assistance to you though.

here's an album that has all the ChevyII/Nova wiring diagrams... click on the proper year, enlarge to full size then "Save" to your own files... maybe it'll be of assistance.

http://rides.webshots.com/album/555104780qhTHfK


i hope others are more helpfull than i've been... good luck ;)

my '65 ChevyII wagon and also my '68 C10 had a defective dimmer switch. cut out the headlights on high beam... replaced the dimmer and all was well.

i know you said it was replaced, but could that still be the issue ???

maybe a tester at the contacts would tell the tale.

The replacement dimmer switch might be a Chinese part, with a 50% chance of working. First question do you own a multi-meter (10 Amp or less meter, Ohm meter, and Volt meter combination)? Electricity is invisible, and unless you have a meter or a 12 Volt test light you stand no chance of resolving these kind of issues. Radio Shack sells both for peanuts. I recommend a self ranging digital meter ($25-40 price range) or at least a couple of leads to make a 12 volt test light.

Big Dave

First thing I would do is test for power at the lights using a test light with the high beams on. If none there, test at the dimmer switch.

Also, I have seen it a number of times where both high beam filaments were out at the same time. Strange, but true.

Thanks for the info.Unfortunatly he tested both headlights away from the sockets direct to the battery and they worked(low&high beam)He also checked both the old and new demmer switches w/ a meter and both checked O.K..We were hoping there was another source to check.We welcome some suggestions.Thanks

Have you measured voltage to the light socket? If so what is it? If it is low could be a ground strap issue. If it reads zero volts it is time for continuity checks of the wiring harness; using long leads and alligator clips.

Big Dave

Have you solved this yet?

If not, if it was mine, the next thing I would do is make sure the wire leading away from the dimmer switch (set on high beam) has power heading to the front. If it does, keep following till you find the break. It must be simple to test that. I wonder, does it have a connection at the bulkhead connector at the firewall?

I would check the wire connections at the fire wall this is a real good place to get a loose connection.
otherwise you need to track with a volt meter were you are losing power.

Did you get this resolved?

I had a problem with my 66 when redoing the wiring. When I put on highbeams the lights went out. Turned out to be the placement of the wires on the floor dimmer switch. Changed the wires around everything good then.