I have a 2004 1/2ton pickup, no extras.bare basics. put my headlights on last night and then hibeam turned them off when I got to a main rd and the horn started beeping, the lights flashing.The horn stopped beeping after 4 miles got home turned truck off and lights were still blinking for 10 minutes. I have no theft, or even electrical door openers. I haven't tried this morning don't want to wake up neighbors yet. Not sure if this happens have a 2yr old battery. Or I have been again sabatogued by the ex? past 2x's sugar in tank, flat tire cut spare from underneath,pulled drive train. Thanks for any info.

SOURCE: Headlights are not working

You seem to have a stuck H/lmp relay, Taking out the circuit breaker only disabled part of the electrics,
If you examine the fusebox / Relay housing s (there may be more than one . You should be able to identify suspect relay (it will be warm to touch) . You may need to examine the Running lights / Dimmer H/lamp circuit if it had one. Putting an Amp meter across ( in line not parallel ) the not running vehicle will indicate drain from battery . There might be a slight arc upon connection but it will level out to near zero drain.

Berlyn Reed

• 492 Answers
• Posted on Mar 05, 2011

SOURCE: Yesterday temp gauge began rising.

SOUNDS LIKE POSSIBLE THERMASTAT STICKING!

SOURCE: 2005 Dodge Truck 2500 / Brake lights flashing while truck turned off / dead battery

i don't know why but dodge trucks back feed threw the trailer lights and leave light on