# Brights only **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** isuzu, rodeo, headlights\ **Created:** [March 7, 2011, 7:20pm UTC](https://community.cartalk.com/t/brights-only/62357 "2011-03-07T19:20:27Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![m45t3rb1ff](https://avatars.discourse-cdn.com/v4/letter/m/e47774/32.png) [@m45t3rb1ff](https://community.cartalk.com/u/m45t3rb1ff)\ **Post date:** [March 7, 2011, 7:20pm UTC](https://community.cartalk.com/t/brights-only/62357/1 "2011-03-07T19:20:27Z")
I’ve replaced the relay and bulbs for my '92 Rodeo but only the brights work when I pull my dimmer switch. How do I fix this and what is the cause of this?? ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [March 7, 2011, 9:40pm UTC](https://community.cartalk.com/t/brights-only/62357/2 "2011-03-07T21:40:08Z")
Check the headlight switch with a voltmeter or ohmmeter. ---
**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\ **Post date:** [March 7, 2011, 10:03pm UTC](https://community.cartalk.com/t/brights-only/62357/3 "2011-03-07T22:03:47Z")
Be more specific. Are you turning on the headlights or they automatic? Have they worked perfectly for 19 years and suddenly failed “out of the blue?” Some of the Isuzus used a combination of 3 relays to control the headlights and regardless of the cause for your problem an accurate wiring diagram would be needed to quickly track the problem down. And yes, a volt meter or even a test light along with the wiring diagram will be needed.