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  1. 9

    77 C30 Power window & Lock wiring issues

    i'm trying to test the tan/gray wires going to the locks, but I can't get the lock to function. putting one to ground and the other to battery and swapping, but nothing is happening with the lock actuator. could it be the actuator is bad? i was planning on using a bosch 4 pin relay. pin 30 to...
  2. 9

    77 C30 Power window & Lock wiring issues

    Could you provide how you wired the relays to the locks? Thank you!
  3. 9

    77 C30 Power window & Lock wiring issues

    Could you provide how you wired the relays to the locks? Thank you!
  4. 9

    77 C30 Power window & Lock wiring issues

    I'm using the old actuators. I was going to get the later pigtails and wire them in. Or do I need to get the correct switch. Also, can I just use a 30amp 5pin relay to trigger these locks? I will need 2 of them correct? 1 for lock, and 1 for unlock? Thanks for all you guy's help. Really...
  5. 9

    77 C30 Power window & Lock wiring issues

    Yup thats the switch I originally had. The later switch I have has the spades in a 45' angle. So I had figured out the issue. I HIGHLY RECOMMEND to watch this video if you are installing a LMC harness.
  6. 9

    77 C30 Power window & Lock wiring issues

    If I unplug one relay it works as intended I believe. a full 12v and the motor sounds good. Once I plug the other relay back in, it acts funky.
  7. 9

    77 C30 Power window & Lock wiring issues

    https://www.gmsquarebody.com/threads/window-switch-color-code.13781/ post #8 states on 77 the black ground on motor frame stud. i'm assuming they are referring to one of the 2 that hold the frame into place? or does it go further down onto the motor itself?
  8. 9

    77 C30 Power window & Lock wiring issues

    thats exactly how I have it hooked up. I have something else going on. Thanks for the response Snoots. Let me do some more digging.
  9. 9

    77 C30 Power window & Lock wiring issues

    I have noticed on the power window switch, I have 5 wires. Pink/brown/blue/bluewhite/lightbrown. I don't see any grounds on the switch itself. I have a new connector but didn't install it. Don't think it will change anything.
  10. 9

    77 C30 Power window & Lock wiring issues

    FYI both passenger and driver door are doing the same thing. Can rule out the switches.
  11. 9

    77 C30 Power window & Lock wiring issues

    Can anyone tell me how the window motor is grounded? On the existing old harness to the windows, there is a black ground with a terminal. I wired it a ground on the steering column, and the ring terminal is wired on the front door channel bolt post. Still have something odd going on. When I...
  12. 9

    77 C30 Power window & Lock wiring issues

    That's what I was thinking. I'll see if I can find another connector. Ground is fine on the truck. I have a ground strap from the motor to frame and frame to body at the front clip. All grounds are touching bare metal. This is the only electrical issue i'm having. The rest of the truck is...
  13. 9

    77 C30 Power window & Lock wiring issues

    Hey guys, new to the forum here. I'm currently wiring a 77 C30 dually. Restored it, and swapped a gen5 6.2 in it with 8l60. I've got everything squared away but the power windows and locks. I did put the relays in the windows. I think I have a grounding issue going on, but not sure what that...

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