need help with some truck problems

[STROKE_THIS_F-250]

Ok, i am going to to attempt to fix some electrical problems in my brothers late 99 f250

Here are some of the problems
-brights hardly ever work
-turn signals work but when wheel goes back to center the turn signal will stay on
-overdrive off switch/light button needs to be switched
-overhead display for temp, mpg etc. needs fixed
-a/c will cut in and out, just recharged and cold for awhile and then cuts out.
-wipers stay on sometimes and have to mess with the switch to turn off

and the grand finale, he told me today he was driving down the interstate and switched to his economy tune and then like all the lights on his dash flickered for a minute. Like wait to start, CEL etc, like when you turn the key on and all lights in dash come on.

I know there has been threads on most of these things. If you could help in anyway that would be great. if you have a link that can fix one of the problems, just post it in this thread.

[kitchene]

My A/C does the same.

[thatguy2010]

Im going to venture to say that your turnsignal switch is bad....just my .02 but I had the same problem and it was the switch.....the ac problem may be as simple as the ac compressor clutch is bad( my problem as well )

[enoyes12]

Do a search for the a/c clutch. Basically check your clearance of the compressor clutch and remove shim or re-shim if necessary. Fixes most of the A/C cutting in and out because the clutch slips under higher pressures. Over head display fix was re-listed a couple of days ago if you look for it. There's a component inside that breaks and needs to be soldered if I remember correctly. Electrical is always a fun issue to diagnose and fix. Best thing is to make sure all plugs are tight, clean all contacts and switches where possible and use volt meter to check for power. Pull the programmer or chip and see if it's something going on with it or it's the truck. Good luck and keep us informed