94 Ranger Headlights Flickering

I have a 94 Ranger 4x4. While driving at night the headlights work fine until after about 20 minutes of driving. At this point the lights begin flickering on/off, and bright to dim. The problem seems to go away briefly if I turn the lights off and let the switch cool down. I think the switch is going bad. I looked at all other connections and they seem fine. The lights do not flicker while going over bumpy roads so I know it is not a loose wire. Should I just replace the switch or is their a way to test it to tell if it is going bad. Thanks.

Suey

Is your AMPs gauge going a-wall?

no, I dont think so. I bought a new switch and will try that this weekend.