spooling 1g Posted November 18, 2008 Report Share Posted November 18, 2008 Driving to work this morning my my head lights would'nt work(i have daytime running lights so there always on)my tails lights and fog lights both worked fine.while driving to work i noticed mydash lights would get very bright for about 10-30 seconds and my headlights would pop on and then my dash lights go back to normal and they'd go back off.It dont vary with rpm,it has a brand new alt.,and i charged the battery last night(i've been having charging issues)It's a 90 talon any help would be appreciated thanks. Quote Link to comment Share on other sites More sharing options...
Rotarded1647545491 Posted November 18, 2008 Report Share Posted November 18, 2008 A bad ground could certainly cause your symptoms. Being 18 years old, your wiring harness will always be suspect. It's fairly simple to daisy chain grounds around your chassis and engine. The only other items in the equation would be the ECU, or a fusible link (if equipped) Quote Link to comment Share on other sites More sharing options...
KillJoy Posted November 18, 2008 Report Share Posted November 18, 2008 Have the CAPs on the ECU been replaced? KillJoy Quote Link to comment Share on other sites More sharing options...
spooling 1g Posted November 18, 2008 Author Report Share Posted November 18, 2008 Ecu is fairly new,car runs and drives fine. Update,on the drive home i noticed when the dash lights brighten up my headlights work again.Could the alt be the culprit?maybe it's not keeping up?I wiggled every ground/power wire i could reach,pulled the battery terminals,and the car stayed running. Quote Link to comment Share on other sites More sharing options...
Rotarded1647545491 Posted November 19, 2008 Report Share Posted November 19, 2008 Ecu is fairly new,car runs and drives fine. Update,on the drive home i noticed when the dash lights brighten up my headlights work again.Could the alt be the culprit?maybe it's not keeping up?I wiggled every ground/power wire i could reach,pulled the battery terminals,and the car stayed running. Take it to Autozone/Advanced and have them run an ARBST test (it's free). This will tell you if the alternator is putting out enough amperage, or has a bad diode, and also load test your battery as well. Your ECU will rob power (shut down) accessories, when not supplied with enough power, to attempt to keep the engine running. I can't even count the number of times Saturn customers came in with a shift to D2, ABS, and other lights on, due to alternator/battery problems. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted November 21, 2008 Report Share Posted November 21, 2008 I would check the headlight switch first and the wiring associated with it try wiggling the switch around and see what happens Quote Link to comment Share on other sites More sharing options...
spooling 1g Posted November 21, 2008 Author Report Share Posted November 21, 2008 Is there a switch for daytime running lights?I think it's the alt.i tested it and i had 18.9v coming out,which i think fried the headlights,i'm gonna swap them out tonght and see if thats the case. Quote Link to comment Share on other sites More sharing options...
spooling 1g Posted November 22, 2008 Author Report Share Posted November 22, 2008 New headlight bulbs work,thanks for the insight it's the alt. Quote Link to comment Share on other sites More sharing options...
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