Truck runs good until I turn lights on the it idle dies down a lot idk what's it doin

 

The lights require voltage and the alternator probably cannot supply enough to keep up with the lights and the ignition system. At idle it's pretty normal, if the alternator can't keep up around 2-3k rpm then you have a problem.

 

New alternator and when I give it gas it seems fine but idk how to fix the idle part

 

That's normal. There's only about 3 windings in an alternator and the stator only produces so much current at a low rpm.

The only fix for it that i know of is to get a higher output alternator.

 

Pro screwed up wiring harness fuse box to battery and I got new one to replace it maybe help?

 

My 89 does that when I turn the a/c on. It doesnt get low enough to cause a problem but it does drop a few rpms when i turn it on. Which is strange because my other 2 yotas go up in rpms.

 

Mine gets almost to point Ur dies

 

It dies*

 

Vsv working? The little valve is supposed to open up to increase idle speed when the alternator is working at idle... kinda like it does with the a/c on

 

Where is this at

 

Also kinda sound like skipping sometimes when I turn lights on also

 

What is your idle Rpm without lights on?

 

Sounds normal to me without lights on but idk true rpm no tach

 

Well that sucks. Turn the idle up a smidge then try again and see what happens. You may not be turning at normal idle which keeps the alt. Output real low like 15 amps or so.

 

Where exactly do you turn it up

 

This http://i606.photobucket.com/albums/t...e/DSC02651.jpg
pic show it in the left top. That screw thats darker than the rest of the intake.

 

How far should I turn it

 

Do it while its running and it shouldn't take much. Make a mark on the housing so you know where you started and only go a half turn or so then you'll hear it idle up or down. Then try the lights. Since you don't have a tech it has to be by sound. Optimally on my 4x4 5 speed its like 750 rpms. But ive run it at 1100 when 4 wheeling because the which needsmore amps.

 

I'll try it and post what result I get

 

But if I have to turn idle up to much to fix it could it be the vav I think it was called