I am doing an article on troubleshooting a chevrolet Tahoe electrical development.
Instructions
1. Early corporeality is to isolate where the botheration is and what other items aren't working either, sometimes there are two or three matters on the twin line. Contemplation for any burnt wires, or charred switches. Whether it involves the rear lights and they are all messed up then the most potential commodity To seek is a wick ground to the chassis, and light grounding.
2. Provided the above checks gone then you keep to gem the fuse box, that normally is under the drivers side dashboard. And if you still get no voltage, then you have to check the ignition switch, you will have to receive to the wire harness in the back and check all the prongs marked with acc. or on. or + pink or red or red stripped wires, and put the meter in volts and put the black probe on a metal chassis ground, and the red positive probe on the wires and check for 12 volts.3. If you don't get any voltage at these points, then you will have to look under the hood for an inline fuses and check them for voltage. If no voltage is found, then go further on to the battery terminals, and strip a little back of the wire to receive contact for the red probe. Directly gaze for the fuse identification chart which gives the fuse dimensions and amperage of the fuse. When you boast the fuse, pull it elsewhere and trial it with an ohm metre, establish on resistence, it should fanfare lowest point or it Testament buzz. Provided the fuse is agreeable then takings the volt metre fix to 12vdc and touch across the two fuse prongs and evaluation polarity crimson to conclusive and the jet to denying or ground. You should glance at a 12 volts or less, and whether no voltage, then effort turning the clue to Acc or on, and analysis again.
Check all the small wires on the positive battery post, all should have 12 volts, if not hen you have a bad battery connector and has to be replaced. Next if you get power to the fuses and the fuses are good then the next step is checking any switches that control the item. If you have more then one item not working then it will not be a switch but probably a relay, these are small as 1x1 inch or as big as 3x3 inch black plastic boxes that plug in. They will be under a large black plastic box that snaps closed. Unsnap the cover or take the cover screw out and look for the relay that is marked as the item that does not work. Take the relay to AutoZone or similar auto parts shop and they will check it for you. In any case the grounds should all be checked by using a jumper wire with alligator clips on each end to clip to the ground on the item and the the other to a grounded area on the car. (bare metal)
