Headlights

[Brian Mills]

Ok, it is my 1978 M 50 motorhome chassis. The headlights work fine on low beam. On high beam if I go up a hill, make a long sweeping corner to the left, or hit a medium bump, (like train tracks), the lights go out. I hit low beam, and they come back on. This is a late 70's wiring with a four lamp system. Funny part is all four are on in high beam mode, and all will go out, sometimes blink. They are bright when they are on, no dimming.

I will be tackling this little quirk early next week! Anyone familiar with this? Try a guess? Something peculiar to high beams only? ...

[ehostler]

My first guess would be the high/low switch or its connector. If that is fine, then your headlight switch may be getting weak.

My '68 Charger did something similar to that. After the intermittent blink outs, the headlights would turn off and then back on, when I would go from low to high or from high to low. The next day, I pulled up the carpet and found that the high/low switch had actually broken. I was able to fix it and everything worked fine from that point on.

[Doug Wilson]

That sure sounds right to me.

[69dartgt]

The same thing happend to my 72 D-100, left me in utter blackness a couple of times before I changed the HL switch (BTW the one I bought at two local chains was way long between the mounting surface and the catch for the knob post...had to go used) anyway, the contacts inside it looked as if they'd been through a furnace three or four times and the ceramic heat sink/insulator on the rheostat was crazed/cracked from heat too. Lucky it didn't blaze my dash...the moral of my story is...check your HL switch

[69dartgt]

In my running on and on I forgot to mention the fact that I could run on low beams for a week and not affect it but after a few minutes on highs...blink, blink...DARK. Too much current drawn through a 30 year old switch.

[Brian Mills]

O.K., sounds good to me. I just remembered that it is a brand new switch. The old one was half disintegrated, this problem arrived with the switch. Been a while in place before I drove the old girl at night. Thank you all.

Brian