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Old 12-08-2011, 08:34 PM   #1
Low Elco
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power lock issues?

Bought an 87 swb gmc that's hard loaded, and as usual, most of it's on the blink. When you hit the power locks, a black box under the dash by the gas pedal clicks, and nothing happens at the doors. Anyone know anything about these?
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Old 12-08-2011, 08:45 PM   #2
J Knight
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Re: power lock issues?

90% of the time when the widows or door locks dont work its either the switch or the motor/actuator. Its always possible it could be a broken wire or a burned plug.
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Old 12-09-2011, 06:51 AM   #3
turner16
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Re: power lock issues?

the noise is the relay. If it is a wire issue it will be where it goes through the doors.
I would check the back of the switches first.
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Old 12-09-2011, 08:16 AM   #4
motornut
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Re: power lock issues?

my 88 had issues with the windows/locks when i bought it
found cracks in the wires in the drivers door tube
that and no motors were ever put in the back doors lol is a big one
changed to manual cranks,was going to take powers out of the 89 but didn't
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Old 12-09-2011, 11:14 AM   #5
ges55
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Re: power lock issues?

Since the relay is clicking, your switches are probably ok. You can get the actuators on Ebay. I got 2 for $50. If your switches aren't making the relay click in both up & down modes, you can pop them out, pry them apart & clean them out & alot of the time that will make them work. Also, sometimes there are rust issues in the actuator linkage that can cause the actuator to not work & that can be fixed by removing the door panel & spraying lubricant on the rusty area. Just follow the linkage down from the lock button. Good luck.
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