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  1. chengny

    What am I looking at?

    enzyme. [(en-zeyem)] A protein that causes other organic molecules to enter into chemical reactions with one another but is itself unaffected by these reactions.
  2. chengny

    NP208c transfer case gasket set ?

    I think that if he wants a gasket between the casing halves, he'll have to make one. The faces of the casing halves are machined surfaces and don't require a gasket - just a light coat of sealant. A gasket was never available as an OEM spare part. Matter of fact, use of a gasket might alter some...
  3. chengny

    NP208c transfer case gasket set ?

    http://www.allstategear.com/NP208-Gasket-Seal-Kit-s/2345.htm $25 and it appears to have the "big one".
  4. chengny

    Door components

    In case you missed it, see post #3 for more on the Pex-fix. Replacing the missing nylon ring with a short piece of Pex tubing was what he was talking about.
  5. chengny

    Door components

    Below, see some info on door handle R&R - from the 1978 Service Manual. You didn't mention what parts you require so I can't offer any leads. And you know - in my experience at least - if you need to slam your door in order to get it shut the problem isn't with the handle. It is more likely...
  6. chengny

    Electrical woes....

    Ah, I get it. When you say "bus on the firewall", you mean the bulkhead connector block. I thought you were talking about the FW junction block.
  7. chengny

    Electrical woes....

    If you're interested, attached is pertinent section of the wiring diagram for the engine side of a 1979 with diesel. Note that the RED 2J circuit is run in the same manner as a gasoline engine (i.e. battery power at solenoid, through fusible link and then straight to the bulkhead connector...
  8. chengny

    Electrical woes....

    Here is how the H/L switch, T/L CTSY & HORN DM fuses are supplied with power. That circuit is protected only by the fusible link down at the solenoid - it does not pass through the FW junction block. If that link were burned it would explain the loss of H/L's and the other exterior lighting you...
  9. chengny

    Dash cluster light issue

    Yes there should be a plug (with a grey wire) in one of the LPS sockets. That is the feed for the instrument cluster lighting: Hunt around under the dash - it is probably hanging loose somewhere.
  10. chengny

    Dash cluster light issue

    Check that the plug for the instrument lighting circuit is correctly seated in one of the fuse block sockets (in the column labeled LPS).
  11. chengny

    86 C10 Will Not Crank

    There is no specific procedure for diagnosing this issue. Just use your meter/test probe and good engineering practices. The starter solenoid control circuit is real simple. When the ignition switch is moved to the START position, power is supplied to the solenoid on a single lead (purple 6)...
  12. chengny

    Another fuel gauge issue

    Assuming I can find the pink wire, what will I be checking for? Loose connection? Bare wire? Very loose connection or a break in the wire. Also, I think it may be a misleading coincidence that your gas gauge appears to be indicating correct (i.e. full) tank levels. I was just messing with...
  13. chengny

    Another fuel gauge issue

    Hey Dave-O. Jerry here. I thought that (given all your delayed wiper experience) you'd be a certified automotive electrician by now. You ask a valid question: Does the sensing wire affect both tanks? I guess I thought of it as essentially two separate circuits controlled by the switch. And...
  14. chengny

    '87 R20 Fuel Gauge Not Reading Right

    Making any progress on sorting that mess out? I can help a little. The orange lead is hot into the brake light switch (shown below) and the white is switched power out. After passing through the MFS in the steering column, it becomes part of the rear lighting harness - carried on the same leads...
  15. chengny

    78 C10 Fuel sending unit wire routing

    I'll try to help explain the way the system worked - and how/why it was wired the way it is. The first thing to understand is that all of the following will only apply to CK 03 trucks with the NL2 RPO option (i.e. dual tanks mounted outside of the frame rails). Also, unlike the later model CK...
  16. chengny

    th400 noise,no power at startup then fine????

    Check that the filter pick-up tube is tightly seated in the valve body and that the o-ring (s) is/are good. You know how loose those filters are - I always think they can work the tube out of its seated position in the VB.
  17. chengny

    Door handle spacer

    Are you talking about this piece (#33)? If so, that part is just a piece of foam rubber. I always thought it was there just to seal up the gap around the regulator shaft and the hole in the door skin. You can easily make one out of a piece of 3/8'" foam rubber pipe insulation. It's about 2"...
  18. chengny

    Brake lights

    Check for power into the brake switch (orange hot all the time from the battery). Depress the brake pedal and confirm power out of the switch on the white lead.
  19. chengny

    Dash Light Issue

    Yes , it does - make a difference. Most aftermarket head units generally don't use a variable voltage supply for backlighting. If the truck's gray wire is not connected to the receiver's orange wire, its either all or nothing when it comes to backlighting. Given that you don't know how the...
  20. chengny

    Need help with overheating issue on my 77 k10 with sbc 350

    If you’re running a belt-driven fan, there are a few things you need to do in order to maximize the engine cooling that the fan can provide. It’s critical that the fan be positioned properly within the fan shroud and that there is just enough clearance around the fan blades. The first thing we...
  21. chengny

    Dash Light Issue

    Is the lamp in the HVAC control panel illuminating - how about the radio? If they don't work either, that would suggest that the entire instrumentation lighting circuit is not being energized. The circuit goes like this: Power from the fuse block (20A T/L CTSY fuse) to the headlight switch on...
  22. chengny

    Coolant Temp Gauge Question

    A false high reading is usually an indication that the gauge's sensing leg is shorted to ground. Trace the DK GRN lead that runs along the valve cover and connects to the sender. This is just a WAG but it might be the case that, the original high reading was caused by a short to ground in the...
  23. chengny

    Need help with overheating issue on my 77 k10 with sbc 350

    Oh yeah - and I think this was already noted in a previous post - the depth of the fan blading into the shroud throat is very important. 1. If the blades are set too far into the shroud, a recirculation effect develops. Say you have excessive clearance between the blades and shroud (this...
  24. chengny

    Need help with overheating issue on my 77 k10 with sbc 350

    Do this simple quick test to check for fouled watersides of the radiator cross tubes. It will also confirm adequate water pump flow and proper t-stat operation; 1. With the engine cool, open the radiator fill cap. Leave the cap off. 2. Drain off enough coolant so that the level in the radiator...
  25. chengny

    Tailgate Handle Assembly

    I think its correct - I don't even have the parts manuals for anything prior to 1973.

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