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Headlight, turn signal problem

Tiny
BMAN6958
  • MEMBER
  • 2004 SATURN L300
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 166,000 MILES
Turn signals only work when headlights are off. They stop as soon as the headlights are turned on. Four way flashers just buzz when turned on. Replaced turn signal/headlight switch and also flasher unit.
Sunday, September 17th, 2017 AT 1:08 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,351 POSTS
This sounds like it can be one of two problems. First you may have a shorted wire or bulb in the system. Do all of the lights work when they are working? Here are some wiring diagrams (below) of the system to help us do some testing. The next is the parking lamp relay is not working.

Here are some guides to get us started:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run this test and get back to us so we can keep helping you.

Cheers, Ken
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Monday, September 18th, 2017 AT 11:41 AM

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