Ctsy fuse when put in makes a clicking under dash as if a short? truck 1998 chevy silverado no lights truck wont start?

Check the switch that is under the dash on the brake pedal arm.

ATC fuse 20 amp ? Power to the ATC control module & encoder motor . Shorted circuit in electrical wiring to one of the componets listed above . Do you know what a electrical diagram is ? How to use a DMM - digital multi-meter to test electrical circuits ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info year , make , model an engine size. Under system click on driveline / axle . Under subsystem click on transfer case controls . Click the search button ,then the blue link. First link / first diagram ,top right . ATC fuse - orange wire to encoder motor an atc control module . One of these has a short to ground probably .

In order to try and help I need the make and year and model. Also the fuse box info is in the owner's manual.

Replace the headlight sw. on the dash and see if that fixes it.

I wonder if the buzzing is coming from the key switch ? (ignition ) . CTSY is always HOT ! you need a wire diagram to see where CTSY wires travel to & from to isolate this draw . I found that the CTSY 20amp fuse is also wired to the parking lights 20A fuse @ fuse block . start there, check all wires, grounds to parking lamps, and switch, it might be your headlight switch thats causing your problem ! replace it and see what happens !

Sorry, I don't have good enough wiring diagram for your model year?
Check for battery junction block, under the hood, one of the positive battery cables should go to it, see if there is a bunch of fusible links, check them. Use a testlight on out put side of link, check for voltage. If there is a handful of links, sorry, I don't know which one. Maybe you will get lucky and the first one you check will be the faulty one, where applicable. I don't usually get that lucky. If you make a hole in wire insulation, use finger nail polish or something to cover the holes.
I thought about using jumper wire for B+ to ecm B fuse for testing. I don't want to suggest anything that might cause you more problems, you need to fix it properly.

I had the same issue. Check fuse number nine.

This problem is usually caused by a door or trunk switch. It could also be caused by a reading light shorting out under the headliner. The only way to find out which one is the cause is to eleviate 1 at a time by disconnecting 1 at a time untill you find the one that is shorting out.Some times it is just the bulb that can cause this try removing 1 bulb at a time first this is the easiet to start at.Also if you have a trailer hitch with wiring eleviate this first.This trailer wiring harness can cause alot of this kind of problems because they are exsposed to the elemnts they corod oftenand short out or get pinched and short out.

check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.

Hello;
The fuse box is under the drivers side dah, on the firewall. Not sure about the cigarette adaptor but the fuses are marked as to what they go to. Hope this helps and please rate me;
Thanks
Rich
RPM Northwest