Hi Beams won't turn off...2005 379

check your circuit breakers, mine would do the same thing when trailer lights shorted out, some kind of safety thing

 

Put a relay in the high beam wiring and a small switch on the dash. To turn the beam off and on.
It is simple and basic
Or get a battery switch to kill the hole electical system(reset the am/FM radio channel s every time.

 

Did you check all the resettable circuit beakers"round white buttons" down behind clutch pedal?

 

Take a halogen hi beam,plug it in and see if it comes on very dimly. If so you have a bad ground.

 

pull the high beam relay(s) out and see if it goes to low beam, if it does I would suspect the signal wire to the turn stalk has an open in it. easy test is to use a test light but hook it up to power and then check the ground side control of the relay (85 or 86 terminal) flick the high beam switch, if it goes off and on it is working correct. if not it is shorted (light stays on) or open (no light at all).

 

check the pigtail connection to the light assembly.