The abs light came on the wippers power window stop working and the heater on 1999 GMC Suburban 1500

The heater only works on high now if i try turning on the wippers or hit the power window switch the heater shuts off and the stereos power goes out

by in Sandpoint, ID on November 18, 2013
3 answers 2 comments
ANSWER by , November 18, 2013
Sounds like a bad ground. Do you have meters to test with?
COMMENT by , November 18, 2013
I do but i don't know where to start or where to look
COMMENT by , November 18, 2013
First start with the body ground off the battery to fender, or engine to firewall. The components mentioned except the ABS are at the left under dash/kick panel area. The ABS is grounded to the frame right under the driver seat/floor board area. Something in the area causing change when door controls are used, Ground not good to let all operate at the same time. Window stops radio & heater.
ANSWER by , November 18, 2013
Agree with prof, this could be a bad ground. Check the braded ground cable from the frame to the engine block near the right hand engine mount too.
ANSWER by , November 19, 2013
based on your answer get a diag done and an estfrom a good shop