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

MrWakeup

The bulbs are going out? Battery is low? Alternator is failing? There's a lot of things that could play into this issue.

[ DI 4 REALITY ]

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

thebax2006

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

don r

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