Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Do your headlights come on?
When you turn the key foward are there any lights on the dash or interior?
let me know
There is a common problem with the key cylinder causing a no start because of the anti-theft system
have you noticed if there is a security light on?
Do you have a test light?
check that you have power to both sides of the 20 amp crank fuse while holding the key in the start position.
the crank fuse is in the underhood electrical center.
click here to view your starting circuit
let me know what you find on the crank fuse and if you need more help
Is the light dimmer on that crank fuse then on the other fuses?
unplug the fuse and check power to one of the pins while cranking is the light brighter now than it was with the fuse in?
you should be getting good power to one of the fuse slots with the key to crank
this start signal is fed to the fuse through the yellow wire on the ignition switch
if you have no power to one of the fuse slots while cranking
you need to check the yellow wire coming out of the ignition switch for power
also make sure you have power coming into the ignition switch on the orange
let me know what you find
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I would be checking the signal in and out of the ignition switch as I described
you should be getting a signal to the crank fuse with the ignition switch to crank if you do not have power to either slot of the crank fuse when cranking power is not getting from the switch to the fuse
you can put the truck and nuetral and parking brake on.
turn the key foward to run position so dash lights come on
use a jumper wire to get power from another fuse and touch it to the crank fuse.
this will bypass the signal from the ignition switch for testing
that yellow wire runs directly to the crank fuse
so if you are seeing power on the yellow while cranking you should also be seeing power at the crank fuse while cranking
if not you need to repair the break in the yellow wire between the switch and the crank fuse
let me know how you make out
A lot of times the wire breaks directly under the fuse. you may want to open the fuse panel to look underneith and check the yello behind that fuse
Do you still have power to the orange into the switch? and yellow out of the switch?
You mentioned you had power on the yellow out of the ignition switch when you originally tested it?
See if you can jump power from the orange to the yellow with a jumper wire at the ignition switch connector
does the engine crank?
if so the switch is bad
that's why I asked you to check power at the crank fuse with it unplugged
check power at the crank fuse with the orange and yellow jumped?
is it dim with the fuse plugged in? but bright if you check the pin with the fuse out?
When you jump the orange to the yellow at the ignition switch connector
the crank fuse should then have a good 12volts 2 boths sides not dim...
if it is dim unplug the fuse and then check for a good 12volts to the fuse slot
you need to verify that power is getting from the yellow to the crank fuse