Headlight Disconnect

[Ward]

I had the same problem, just switched the headlights to the DRL's to save power when using TuneECU

 

[Idaho Red Rocket 3]

Unfortunately no answer to this specific question for me, (in case anyone else runs into this issue in the future) but I was able to program the map successfully by hooking up a separate battery and tender, so I ultimately accomplished what I needed to.

What tune did you install. ? How is it modified ?

 

[LesL]

The owners manual says the following,:

1. Ignition 7.5
2. Lighting 7.5
3. Fuel pump 7.5
4. Instruments 5
5. Battery 7.5
6. Accessories 20
7. Cooling fan 20
8. Anti-lock Braking System (ABS) 25
9. Engine management system 20

I am 100% positive I pulled the #2 fuse for lighting and still saw lights (maybe it was just the DRL though?) The only plausible 20 amp fuse would be accessory. Are you saying the headlamps or DRL's are on the accessory fuse?

Same 2020 as mine…the lighting fuse in that year does not supply power to the headlights. This was changed in following years. Only way is to manually disconnect them or (as I did) hook the battery up to a good booster.