Ac stops working when headlights on

[Ronfoox]

Hey there, i have a 94 mazda b4000 4x4 recently i started noticing the high bean dash light sometimes it turns on super dimmed with both dash turn lights this issue comes and goes is not constant, when it happens also passenger side headlight dims and ac stops blowing cold if i turn off headlights and leave courtesy light on ac works fine. when the issue starts ive tried opening the hood to check. but as soon as i open the hood it goes away.. does anyone has had this issue before? thanks!

 

[snoranger]

It’s a bad ground. Check the ground wire to the body right by the battery.

 

[bobbywalter]

yeah....and the ones under the kick panels in the cab. the dedicated hvac one is sometimes loose and the paint dont help.

 

[RobbieD]

Definitely sounds like a ground problem.

 

[Uncle Gump]

Just going to agree with what's been said.

I also moved the post to the electrical forum.

 

[Ronfoox]

thanks! guys im going to be checking all grounds today.