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Q:

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

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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
(3) Answers
(2) Comments
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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.
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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.
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