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  1. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    h Are talking about that white space in the middle of the engine side of the BHC? If so that is the section that contains the wiring for the forward lighting group. Since that fwd light section has no wires involved with the fuel system, they left it out for clarity. I see the 120 enter the...
  2. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    For future discussion BHC = bulkhead connector I'm not really sure what it is you want to do. Let me see if I read this correctly; As it is now; the 120 BRN/WHT enters the BHC at A3, makes a u-turn inside the cab, re-emerges at G3 and then heads back to the fuel pump. What you propose to do...
  3. chengny

    Electric Power Issues

    Just another day in Square Body Paradise.
  4. chengny

    Motor id

    This is what I see: F/06/23/CRA 305 - built in Flint - June, 23 CRA suffix can indicate 3 different engines with 2 possible years of manufacture 1977 (1) or 1982 (2). All 3 were rated at 145 HP. Switch to the partial VIN code for year: 17K587395 1/7 = Chevy - assembled in a year ending in...
  5. chengny

    Fuel tank selectrical issue

    The issues are: truck starts rough, sometimes it quits, but once warmed up it’s ok. If I use right tank the truck is running fine, however if I select left tank, engine will quit and service engine soon will come on (code is 43). So, if you start up on the LH tank, it never runs well - even...
  6. chengny

    Unused ground buss and...

    Without knowing the model year, it's difficult to say for sure what that wire is. But if it is the ground wire for the seat belt warning light/buzzer and you connect it to the ground bus block, the warning light and buzzer will stay on until the timer shuts them off. The BLK/WHT 238 is...
  7. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Yeah, I noticed that too. It seems to be only that way for the 88 dwgs. Normally you just visualize bringing one of the edges on both halves together (bottom as in the example) and then image flipping the opposite edges up to meet. That results in how the connector pins would actually lay out...
  8. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Fwd lights and horns: That should keep you busy for awhile. Good luck.
  9. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    ECM inputs & outputs:
  10. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Fuel system:
  11. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    B1 = Empty B2 = 3 PNK - to ignition coil primary B3 = 6 PPL - to S terminal on starter solenoid B4 = 2 RED - Battery power to ign switch BATT terminals C4 = BRN 25 alternator terminal 1 to generator warning light on dash (if you have gauges this wire won't be there - I think) D4 = 439...
  12. chengny

    Electric Power Issues

    Something simple you might want to investigate before tearing into the harness/fuse block: For some reason, there are two power feeds coming out of the fuse block that have the designation ORN 140. One is hard wired and services the brake/hazard light circuits - via the 20 A STOP-HAZ fuse...
  13. chengny

    What is this cable for?

    It should neither be omitted or replaced with a fuse - there should be a fusible link inserted into that section of wire. Just cut the 2F lead at a point a few inches from the JB - but before the split - and splice in a new link. It's easy. First determine the size (amp rating) of the link. If...
  14. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    C & D - 3 & 4 (yellow box below) are all associated with the windshield wipers We'll do some more later.
  15. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Anyway, I guess your questions are; 1. Why are there 5 hot wires (wire L has 2 branch leads) coming off the firewall junction block going into the cab - via the bulkhead connector - when there should only be one? 2. What do each of these leads connect to? Here is marked up image of the...
  16. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    First, to be sure which wires are being called what - is the image below correctly labeled? 2nd question. When you say this: They all terminate on the left side of the Bulkhead Does that mean that they all transit the FW at the main bulkhead connector - specifically in the engine wiring...
  17. chengny

    Brake line kits

    And the small upcharge (about 13%) for stainless is worth the money.
  18. chengny

    Electric Power Issues

    At this point, nothing really works unless I turn on the lights. In other words, the radio doesn't come on until the lights are on. The dome light will not come on until the light switch is on, but the door jamb switches do work the light off when they close. Is it only the radio and dome...
  19. chengny

    87 Oil pressure guage issues

    Jeez Darryl, you had me second guessing myself for a while there. I had some spare oil pressure gauges on hand that came out of 86-87 trucks. I carefully compared them with the 25025157 (80 psi gauge shown above) and as far as I could tell they are identical. The only difference I saw was that...
  20. chengny

    HVAC speed control

    Jeez, I hope you haven't cut your new harness! If you didn't (cut it), use some WD-40 and a screwdriver to release the two hole grommet by pushing it back into the cab. Chuck your butchered harness. Pass the engine side wiring on the new one through the opening. IIRC, all the connectors will fit...
  21. chengny

    Unidentified Air Filter Intake

    YEA Yeah, yeah he nailed it. It's a preliminary air separator used as part of the RPO K46 option (air cleaner, heavy duty, pre-cleaner). It is essentially a cyclonic type air filter/separator. The bladed disc doesn't spin. It is designed to impart a centrifugal force to the incoming air flow...
  22. chengny

    87 Oil pressure guage issues

    I recently bought an NOS matched 80 psi set - manufactured by Delco. So yeah, they are out there - and as Derek suggests they were primarily used in diesel applications. But they were also OEM equipment for Corvettes and several other GM vehicles with gas engines. Finding them takes a bit of...
  23. chengny

    HVAC speed control

    Speaking of bad medicine......
  24. chengny

    Aftermarket grille brands.

    Classicparts (not to be confused with Classic Parts USA) still has NOS/OEM grills for 85 -88 C/K. They list for $205 (+ $27 for S&H). https://www.classicparts.com/1985-88-Grill-OEM-GMC-Dark-Gray-w_Single-Headlamps/productinfo/61-265/ For some reason, they warn that these grills are only for...
  25. chengny

    What is this cable for?

    Yeah, that's it -you can connect to either stud. This shows how the red lead connects to the battery schematically: It normally runs in the loom traced in yellow:

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