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  1. dsteelejr

    1980 Starter wires?

    Thinking about it, the only time I’ve seen a yellow wire going to starter was for points ignition. It was to supply direct battery power to the point system while the engine was cranking. I don’t know why you’d have that on a 1980 unless the original owner ordered the truck with the HEI delete...
  2. dsteelejr

    1980 Starter wires?

    Aside from the heavy AWG battery cable to the starter, there should be a 12 AWG purple wire on the S post of the starter solenoid that is the signal from the key switch to crank the starter. There are two 12 AWG red wires that are attached to the primary power post. One wire goes to the junction...
  3. dsteelejr

    Settling on timing

    Something isn’t adding up. How did you figure TDC?
  4. dsteelejr

    Misfire when hot

    Always start with the basics, the easiest things you can check before tearing everything apart. You said you’re running a Holley 750 race carb, does it have a choke? Is the choke fully open at operating temperature and staying open? If that’s not it then try changing the ignition module and...
  5. dsteelejr

    Wiring

    Here's a crude diagram for how the fuse block gets constant power. Wiring changed slightly over the years so your may differ slightly or if you're using an aftermarket harness. These should all be red wires.
  6. dsteelejr

    Pro Flo 4 with Delphi FE0114 or ACDelco EP381

    What kind of power are you making with your 350? Asking bc I was trying to decide what fuel pump to use. I'm building a mild 412 for an '88 K5 to replace the tired 350 TBI. Just looking around I couldn't find anything else that met the pressure and flow rates PF4 wants. My mild build will...
  7. dsteelejr

    Bolt hole pattern on the front of the heads

    I have an ‘88 K5 that is 100% stock with 276k miles on the original TBI 350. I’m going to be replacing that 350 with a SBC 400 with an Edelbrock top end kit and Pro Flo 4. The Blazer still has working A/C and I want to keep it working after the swap. I have a set of Edelbrock 5089 heads, which...
  8. dsteelejr

    Fuel gauge troubleshooting

    I’ve never heard of an output test either, but in the spirit of checking everything I tested it and would’ve expected 12V in, 12V out. I checked the terminal on the plug that plugs into the switch and it’s getting the same 8.5V I measured at the prong on the gauge going to the sending unit. I’m...
  9. dsteelejr

    Fuel gauge troubleshooting

    1973 C20 with factory dual tanks. The truck has been in my family since ‘84 and most everything is factory or stock. The wiring is not modified or hacked up. The fuel gauge worked fine for both tanks until one day the needle started pointing to the 3 o’ clock position for both tanks. I am aware...
  10. dsteelejr

    What is this? Asking for a friend

    Not sure what transmission he had, but I’ll bet you’re right, it’s probably for cruise control and possibly lock up torque converter
  11. dsteelejr

    What is this? Asking for a friend

    Orange for the power feed into the switch and white for the switched power to active the brakes lights
  12. dsteelejr

    What is this? Asking for a friend

    I don’t think the truck did. It’s a ‘78 and as far as I know cruise came out in the 81+ years, correct me if I’m wrong. But the column was out of an ‘86 and may have been in a truck with cruise.
  13. dsteelejr

    What is this? Asking for a friend

    My buddy has a ‘78 that’s been Frankensteined by POs. Hes doing a steering column swap and asked me what this is. My guess is a brake light switch, but wires are wrong color. Any ideas?
  14. dsteelejr

    What does these green and blue wires go to

    Reverse lights
  15. dsteelejr

    New engine installed - need TBI timing/idle help

    This is on my ‘88 K5 with a 350. Everything is 100% stock and unmodified. The brown wire is near the bulkhead connector. Hope this helps.
  16. dsteelejr

    LED conversion

    Headlights and turn signals are on separate circuits, I don’t see how adding headlights would affect turn signals. You only had problems with the turn signals after installing LED head lights? I still use sealed beam halogen headlights, but I had issues with the LED side marker/turn light when...
  17. dsteelejr

    Where can I buy the warning light lens like fasten seat belt choke lens and 4x4 lights lens

    I know I haven’t seen it all and that’s the first low coolant one I’ve ever seen. Any idea what year or application it’s for?
  18. dsteelejr

    Where can I buy the warning light lens like fasten seat belt choke lens and 4x4 lights lens

    I have a ‘73, ‘80, ‘88, and at one time had an ‘84. I’ve never seen a square with a low coolant warning light or a provision for a coolant level sensors. They’re called tell tale lights and generally they are brake, fasten seatbelt, four wheel drive, and choke. Later, on TBI engines, choke was...
  19. dsteelejr

    gear ratio

    Those codes don’t tell you the gear ratio. Your best bet is to remove the differential cover and count the teeth on the ring and pinion gears.
  20. dsteelejr

    Dash blinker lights glow when the marker lights are on.

    I fought the LED fight with my ‘80 K25 three and half years ago using LED bulbs from Amazon. Not for style, but just to have better, brighter exterior lighting. The front turn/park LED lights worked fine, but the side turn / marker lights only blinked with parking lights off. I messed around...
  21. dsteelejr

    Which posi unit do you like?

    Just some opinion here based on my own meandering experience. My ‘80 K25 has a Detroit locker in the rear and a TruTrac upfront. My ‘73 C20 has the factory locking diff (RPO G86, it’s not a G80 locker), which is a clutch pack style limited slip. My ‘80 K25 is my work horse and off road truck so...
  22. dsteelejr

    Recognize this?

    I have the same part from my ‘80 K25, but in better condition. I don’t remember where it came from or what it does. It’s been in my spare / unknown parts pile for a long time. Didn’t want to throw it away in case I need it someday. Would be great if someone could shine some light on this.
  23. dsteelejr

    Has anyone used an Edelbrock Rochester Quadrajet carburetor?

    I had one of those on my ‘84 K5 many, many moons ago when I lived in California and had to be emission compliant. The carb ran fine, but overall the engine ran like crap because it was a California smog dog.
  24. dsteelejr

    6.2 Diesel Instrument Gauge Cluster Swap??

    Because of changes between 73-80 and 81-87 I was mistaken about the orange wire in my first reply. There is no 1982 wiring diagram in the reference library here, 1983 is the the closest match. The pics below are the base cluster and cluster with gauges and no tach with the pinout. Go to the...
  25. dsteelejr

    6.2 Diesel Instrument Gauge Cluster Swap??

    You may need to repin the connector since the two clusters use different printed circuits. I’ve never messed with a 6.2 diesel truck, but I have swapped out idiot lights for gauges with tach on my ‘80 gasser. You need to consult a wiring diagram from the reference section to be sure about what...

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