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  1. L

    Allow cranking, but prevent starting

    Thanks, which wire is that?
  2. L

    Allow cranking, but prevent starting

    Hi, how can I crank my engine ('79 350 H.E.I.) without allowing it to start? Is there a fuse or a cable to disengage the ignition when cranking the engine with the starter? Thanks!
  3. L

    EFE-System

    On my '79 K25 350 I had to remove the vacuum-actuator of the EFE, because it doesn't work anymore. Now, with the actuator completely removed, do I have to lock the heat valve in the exhaust-manifold, to stay in the open position (towards the rear), or will it stay open due to the exhaust...
  4. L

    Replacing mirrors

    Thanks Bruce! What did you do to cover up the holes of the original mirror?
  5. L

    Replacing mirrors

    Hi all, I want to replace the large mirrors on my '79 K20 with the smaller ones. Do I have to drill new holes or can I use some of the existing holes. Do I have to modify anything else? Thanks!
  6. L

    Short brake hose?

    Very grown-up answer! Thank you. The mechanic thought, the former owner installed the wrong hose, which is too short. He was just concerned, that the hose would tear apart, when he lifted the truck, because the hose was holding the axle up. I didn't say it's a design flaw. I just wanted to find...
  7. L

    Short brake hose?

    Thank you very much for the explanation. I think you are right. Everything looks pretty factory. That's why I do not understand, why the brake hose seems to be so short. And even the new hose I ordered is the same length. I cannot find longer hoses for this truck model anywhere. The hose is...
  8. L

    Short brake hose?

    Hi all, my mechanic lifted my 1979 K25 on a hydraulic ramp (under the frame). Then he told me, that the rear brake hose was too short, because it was so tight, that it seemed, it was holding up the rear axle, when the truck was lifted on the ramp. I believed him and ordered a new rear brake...
  9. L

    I twisted my fuel line...

    Hi, while trying to change the fuel filter, I twisted my fuel line a little . Do you think, it has to be replaced? If yes: does anyone know the OEM-Partnumber for the fuel line (1979, K2500, 4 barrel Quadrajet). I searched for hours, but I cannot find this part in the parts catalog or the...
  10. L

    1979 K25 with gauges - Indicator Lights

    Hi all, my 1979 K25 has gauges (Volts, Oil Pressure, Temperature). When I switch on the ignition, only the "Seat belt" and "Brake" indicator lights below the fuel gauge light up. I wonder if there are other indicator lights (Generator, Oil pressure, Temp.) installed but not working on my...
  11. L

    Which bulb?

    Thanks guys! I have found the correct bulb. As you mentioned, it is a 211-2!
  12. L

    Which bulb?

    Hi, does anyone know, which light bulb fits these cargo lights (installed on my 1979 GMC K25)? The distance between the two connectors (marked in red) is about 1.7 inch. Thanks!
  13. L

    What is this cable for?

    Thank you so much for the detailed explanation Chengny :happy107:! I took a closer look yesterday and found, that the cable that seems to run through the firewall in fact goes up to the junction block (where it belongs) and, that there is a fusible link still installed, that looks exactly like...
  14. L

    What is this cable for?

    Thanks Bruce for the explanation!
  15. L

    What is this cable for?

    Thanks! In the schematic it seems there was a fusible link connected between the wire and the junction block. Can I omit this fusible link or should I replace it with a fuse?
  16. L

    What is this cable for?

    Thank you! Do you mean the left junction block on the firewall in the picture?
  17. L

    What is this part?

    Thank you! Can you tell me, where the hose is supposed to connect to?
  18. L

    What is this cable for?

    Hi, I bought a 79 GMC K25. It seems, that it was once equipped with a dual battery setup. However someone removed one of the batteries and some of the cables. But there is still a "Divi-Charge"-Device left, which is connected to an unfused red wire that comes directly out of the alternator and...
  19. L

    What is this part?

    ...See picture. Thanks!
  20. L

    Is that the horn relay?

    Unfortunately the horn does not work. That's why I'm looking for the relay :)
  21. L

    Is that the horn relay?

    Hi, is the white box in the upper part of the picture the horn relay? Thanks!
  22. L

    Hood liner: Asbestos?

    Hi, can anyone tell me, whether this two parted hood liner in my 1979 GMC K25 (Californian Truck, Fremont Plant) is the factory installed original part? If yes, what are the chances, that it contains asbestos? Thanks!
  23. L

    1979 K25 Automatic NP203 or NP205

    Thank you! Is it an easy swap (205 for a 203)? I mean, is it like experimental or more like a standard modification? Will it make future repairs more difficult, because of non-standard parts?
  24. L

    1979 K25 Automatic NP203 or NP205

    Hi, I'm about to buy a 1979 GMC K25 . I read, that the 1979 Automatics had Full-Time 4WD and the NP203 transfer case. But this one has manual locking hubs on the front wheels and the transfer case lever has four positions: 4L, N, 2H, 4L. Did GM switch to the NP205 during the model year 1979 or...

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