High beams quit working.

[mrdave03]

I'm hoping for more advice. I had some electrical issues. Bad voltage reg.. and battery. Broken red wire from battery to junction on horn relay. I replaced the red wire. Replaced the voltage reg with a Duralast VR715. A new battery. Everything works great once again truck starts and runs great. Alternator was tested as fine.. it now sends back 14 volts as it should. Only problem is I only have low beams. When I kick the foot switch the dash "Bright" light comes on but the headlights go out. I replaced the bulbs. No luck. I pulled the connector from the dimmer switch. Jumped both sides.. the same thing happens. Low beams work... high no.. "Bright" light comes on.. so dimmer switch is ok. Bulbs are ok. I did a quick wire check I see nothing bad... any more ideas where I might look?

[Alan's Classic]

Do you have power on the outside of the firewall? Maybe the firewall connection, just guessing. If you don't get much help here I'll move ya to electrical. Maybe it's something common to the 60-66 trucks.

[markeb01]

There's a harness connector on the radiator support on the driver's side. It seems odd only the high beams would quit, but that connector may be only partially inserted or corroded on one of the terminals. Another thought is to run a separate wire from that connector (coming from the dimmer switch) directly to one of the high beam terminals, to determine if there is a break somewhere in the grille harness leading to the bulbs. It's been a long time since I've worked on a stock headlight harness, but I believe the wire coming from the dimmer feeds the driver side headlight socket, and then is jumped from that terminal/socket to power the passenger connector. If there is something wrong at the radiator connector, or at the driver side headlight socket, that could knock out power to both high beam filaments.

[fleetsidelarry]

like Alan and Markeb01 noted, there are 2 connectors: one at the firewall and one at the radiator support. the wiring diagram shows the feed for the hi-beam indicator as branching off the backside (interior) of the firewall connector where the hi-beam feed from the dimmer switch plugs in. this suggests to me that you do have power to the interior side of the connector. these connectors cause problems on our trucks often. (I finally just by-passed the tail light/brake light firewall connector completely)

[mrdave03]

Thanks.. I did run a jumper as Markb01 suggested and the lights lit. Also yes the drivers side feeds the passenger.. both came on when I jumped to the high terminal on the bulb socket. So.. I pulled the firewall connector and it looked a bit green on some of the terminals. I cleaned them.. straightened them all out.. put it back together and wallah.. high beams! Thanks for the input... hopefully that is the last bug or a while...