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  1. chengny

    Looking to get a winch

    I wanted a front receiver for my 86 Sierra Classic real bad but they were not available anywhere (at least back when I was searching for them - maybe 10 years ago). I finally ended up fabricating one myself. It was a simple design but worked well. I had a Mile Marker 15,000 lb winch (POS BTW)...
  2. chengny

    Taillights/Tag lights out

    I gave up until I turned on my lights... I must have jostled something when messing with the fusebox. What the heck. These have NEVER worked. I bet that is exactly what happened. I also bet that eventually the problem will return - but who knows, maybe it won't. Wait and see. I always live by...
  3. chengny

    water pump, Alaska 86 GMC Sierra classic 1500 4x4

    The B.C. (on a 4 bolt flange) is simply the distance across the flange face between two diametrically opposed bolt holes. This image explains it better than I can: all 3 When you go to make everything up there will be 3 sets of bolt holes that need to be lined up in order for the bolts to...
  4. chengny

    Taillights/Tag lights out

    The headlights are on a separate circuit. You are concerned with the BRN 9 circuit. It supplies the parking/marker lights (both front and rear) as well as the tag lights. The BRN 9 circuit originates at the H/L switch and runs straight to the cab side of the firewall connector block. There are...
  5. chengny

    water pump, Alaska 86 GMC Sierra classic 1500 4x4

    Measure the bolt circle (distance across the face from one hole to the other - that passes through the center) on all three of them. Since the fan and pulley haven't been changed, you'll probably find the B.C. on the water pump driven flange doesn't match. BTW - read this from Gates on...
  6. chengny

    gauges oil pressure & fuel

    Yeah I get what you mean - and it seems like we're both saying the same thing. Unfortunately (and especially since you have already installed a new sender), the symptoms you describe don't normally suggest a problem with the gauge circuitry. It seems like everything is working as designed...
  7. chengny

    gauges oil pressure & fuel

    I don't know if you were aware of this TSB. I know it only references 1986 models but that was a longtime ago and things get fuzzy - not to mention changed out. You might want to look into it. The first thing that crossed my mind when I read your OP was a mechanical interference issue. I'm a...
  8. chengny

    gauges oil pressure & fuel

    The oil pressure gauge issue will most likely be due to an intermittent bad connection - it could be at the sender end, bulkhead connector or at the instrument cluster. While you're checking the connection at the sender, that's good time to be sure there is 12 volts available on the TAN wire...
  9. chengny

    1989 R3500 Dual Battery Question

    From what I had read, this was to power a trailer (there is a power connector at the wheel well in the bed). What other items were typically powered using the secondary battery? In addition to trailer wiring, the system was also designed to supply power to camper equipment. I have a few things...
  10. chengny

    90 Suburban ECM Fuse Popping

    On the 5.7 motor, a dual function oil pressure switch/sender is used. It has three leads connected to it. A single TAN lead is connected to ground via a variable resistance - and that just drives the dash gauge. The ORN 440 supplies power to both the fuel pump relay and the fuel pump pressure...
  11. chengny

    Parking brakes

    Maybe these images can help you. They are from the 84 service manual & parts list:
  12. chengny

    87 Suburban Heater Core Box Question

    Things didn't look so good for a while however. https://www.gmsquarebody.com/threads/inner-cab-heater-ac-housing-reference-pics.4809/page-3#post-170554
  13. chengny

    87 Suburban Heater Core Box Question

  14. chengny

    How does the oil gauge function? Mine is pegged to the right

    A DK BLU lead was used in later models. It connected to an oil pressure switch, not the sender. The pressure switch was is part of the choke heater circuit. The sender is only to drive the oil pressure gauge.
  15. chengny

    Weird reverse light problem

    Ah hah! Might be nothing wrong, but I'd look at that first.
  16. chengny

    Back to intermittent wipers..

    https://www.gmsquarebody.com/threads/intermittent-wipers.21650/#post-416142
  17. chengny

    Weird reverse light problem

    Inspect the rear lighting harness. Make sure that it isn't pinched between the frame and body somewhere. Also, if any section of the harness is routed close to the exhaust system, check for signs of heat damage.
  18. chengny

    Dash Lights and Power Window Problems

    On the dash illumination issue, there should be a gap between the cluster retainer (the black plastic piece that covers the gauges) and the gauges themselves. That gap is how the light from the lamps illuminates the gauges. I just looked at an assembled cluster and the gap looks to be about...
  19. chengny

    Gauges and headlights electrical issue

    Don't touch the painted on details with anything. They will smear very easily. Seems like the white paint smears the easiest. Remove the gauges and rinse them under a strong stream of warm water in the kitchen sink. That will remove most of the dust. If you still have some dusty areas, use a...
  20. chengny

    How does the oil gauge function? Mine is pegged to the right

    As noted above look for a tan wire. It also can be identified by the special boot over the connector. The lead is offset from the center of the boot: If you can't find the tan lead and need to run a new one from the firewall, it will originate at the D6 socket as shown in the image below:
  21. chengny

    Weird reverse light problem

    Yes, that's correct. I didn't know if you had checked whether that was the case. For that to occur, the conditions have to be right. With the H/L switch in off (i.e. not in the H/L's or parking lights position). Move the gear shifter to R. If the BRN 9 and LT GRN 24 circuits are cross...
  22. chengny

    Gauges and headlights electrical issue

    The headlights are on a branch of share a power supply that also feeds nearly every other circuit in the truck. Mostly through the ignition switch. If turning on the H/L's causes reduced performance in other circuits, that would suggest a voltage drop in the entire electrical system. Does the...
  23. chengny

    Weird reverse light problem

    The lead to the parking/marker lights (BRN) is shorted to the lead for B/U lights (LT GRN). Inspect the rear lighting harness. Make sure that it isn't pinched between the frame and body somewhere. Also, if any section of the harness is routed close to the exhaust system, check for signs of...
  24. chengny

    85 C10 Fan help

    The gauge and sender have to be compatible. The OEM 1513321 "nail head" style senders are getting wicked hard to find. The after market replacements don't have the same resistance curves as the original senders. Read these threads - a couple of very knowledgeable guys cleared things up ...
  25. chengny

    90 Suburban ECM Fuse Popping

    You might want to inspect the rear lighting wiring loom too. It runs from the main bulkhead connector at the fire wall and heads back. In addition to the leads for the rear lights, that loom carries the wiring to the fuel pump/gas gauge sender. I am not at all familiar with 06 body style...

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