Question about 1999 GMC Suburban

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Car wont store radio settings

What are these orange,brown &grey wires from the trucks radio harness

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Red is the circuit you looking for it is current from battery
that is the current that keep the radio memories
orange is ignition current
brown for dimming light of radio
grey is for speakers
hope it helps

Posted on Mar 25, 2014

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skychief2001
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SOURCE: 1990 Chevy GMC Suburban alternator wiring

Well, according to my diagrams for 88-94 models, the alternator only uses the red and brown. There are pink-black wires that power some of the sensors and solenoids but should go to a fuse marked ECM in the fuse box.
Have you tried hooking up the harness without using the pink-black wire ?

Posted on Aug 30, 2012

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