1993 honda civic Ex head lights come on but the lights or dim.what can cause that to happen? There not bright?

1993 honda civic Ex head lights come on but the lights or dim. What can cause that to happen? There not bright?

The bulbs are going out? Battery is low? Alternator is failing?

There's a lot of things that could play into this issue.

Go to a Parts Store and ask them to check your Alternator and Battery. If they're good, the most likely cause is a loose, wet or rusty GROUND on the lighting wiring harness. They are the wires bolted to metal, on Jap cars they will be Black wires. They need to be clean, dry and tight.

Causes can be; weak battery, weak alternator, slower idle than spec, headlight covers severely oxidized.

Bad ground wire running to the headlight socket. Many times you can fix that by connecting another ground wire to a headlight socket.

Poor earth or "frosted" headlight covers. The latter problem can be solved with a headline restoration kit sold in most car accessory shops.