1999 GMC C1500 4X4 problems

CALGARY12

MEMBER
1999 GMC C1500
5.3L
V8
4WD
AUTOMATIC
205,000 MILES

My truck is stuck in 4lo I have no lights on the selector switch and pressing them doesnt make a sound or anything. I have tried disconnecting the battery and atc fuse for 30 minutes. Right from start up the lights do not flash or anything. Would really like to get it out of 2wd atleast thanks for any help.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Have you checked all fuses under the hood? It sounds like there is a power loss to the switch. Have you checked for power to the switch? As well, have you checked for power to the actuator on the transfer case?

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Thursday, December 26th, 2013 AT 1:38 PM

CALGARY12

MEMBER
3 POSTS

I checked the ATC fuse under the hood which is good and I just checked the 4WD fuse in the interior fuse box which was good to. I noticed right at start up all the 4wd option lights flash for a quick second then stay off. I am not to sure how to check for power to the tcase actuator. Do I need a multimeter or just should I look for disconnected cables?

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Thursday, December 26th, 2013 AT 1:46 PM

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

You can use a volt meter (multimeter) or a test light to check. Also, check to make sure there is no damaged done to the wiring or excessive corrosion on the connectors.

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Thursday, December 26th, 2013 AT 1:55 PM