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  1. R

    Wiring ID help - firewall

    What you're calling a "relay block" looks to be an added-on circuit breaker.. A relay must have a MINIMUM of 3 wires/terminals, most have 4.. The reason you don't see it on a diagram is because it's not a factory installation so it's anybody's guess as to what purpose it serves. My guess would...
  2. R

    Unplugged wire…

    The procedure for checking temperature gauge, fuel gauge, and in your case, oil pressure gauge. As I stated previously, check the fuses. Disconnect wire at sending unit. With ignition ON, the needle should move all the way to the left.. Ground that wire and the needle should move all the way to...
  3. R

    Brown timing wire diesafter unplugged

    Here ya go... https://www.gmsquarebody.com/threads/diagnose-1st-replace-parts-second.42621/#post-903306
  4. R

    Unplugged wire…

    That bell shaped sensor is for the oil pressure gauge. Tan wire (not the one in your pic) connects to it.. The other smaller sensor is an oil pressure switch. It's the "controller" for the electric choke. The switch is OFF when no oil pressure is present and ON when there is pressure. This...
  5. R

    Printed Circuit Question 79 K10

    That would work very well only if the broken trace were a ground path.. The broken trace the OP has can't be repaired using that method.. I've repaired several broken traces by soldering a "bridge across the broken spot. Scrape the coating off down to shiny copper, but don't further damage the...
  6. R

    86 K20 4x4 350 Holly Carb - Crank, No Start

    Light failure and no start condition probably not related.. With any light failure, the first thing to check is fuses.. Simple fuse replacement will not cure the problem. The cause of the fuse blowing is due to excessive current flow.. Number one cause for this is a short in the circuit...
  7. R

    85 GMC Engine Wiring Questions

    Dontcha just love it when a "hacker" goes into a harness and cuts everything loose.. As to that pink/black wire. It runs all over the place providing ignitioon On power for lots of stuff.. Starting with the ignition hot circuits, ignition ON voltage is used to feed the electric choke. A wire...
  8. R

    Need an electrical (220v) second opinion

    The source doesn't play a part in the picture, only the load.. 10-3 is good to 30 amps at 50 feet, dryers, appliances, and some AC systems.. At 22 amps, you're kinda close.. To be safe, I'd suggest 8-3.. YMMV......
  9. R

    Need an electrical (220v) second opinion

    Now what am I to do with these 2 cents I just dug up???
  10. R

    Going back to original OP gauge

    One last bit of "clean up" and you'll be done.. You don't want any part of a bare wire exposed.. Solder the crimped terminal and then slip a piece of heat shrink over the entire terminal. Shrink it down with a little heat and plug the terminal into the sender.. You're done..
  11. R

    Going back to original OP gauge

    No, you're mistaken about the terminal count on a gauge type sensor. The oil pressure sensor for the gauge is that bell shaped metal can (in your picture) with a single spade terminal on top.. The pressure switch for the choke is a two terminal device much smaller than the gauge sensor. If the...
  12. R

    Diagnose 1st Replace parts second

    I second that motion.. What you're doing is referred to "hyjacking a thread".. Sort of like butting into an ongoing conversation and changing the subject. You're new here and this is your first post, so as for me, you're forgiven. @viaminveniam, go to the 'INTRODUCTION" section and start a new...
  13. R

    Going back to original OP gauge

    If you thoroughly understand how the choke light works, you know that when the choke light is ON, no voltage is being applied to the choke itself. The light turns off when the choke is "turned on".. Originally, your truck was equipped with 2 oil pressure sensors.. One sensor, as depicted in...
  14. R

    Parking Brake Light Not Coming On

    Before you dig into the cluster, do the easy stuff first.. A simpler test can be done.. Disconnect the tan wire at the proportion valve.. Ground it to a suitable place.. The "brake" light on the cluster should come on.. This will determine that the bulb and cluster plug are intact. If it doesn't...
  15. R

    Newbie Vortec Cam Question

    Like John said -- That manifold and those vortec heads will not play well together.. Vortech heads are designed for moderate lift low RPM "grunty" engines.. They run out of flow around 4,000 - 4500 RPM.. That Pro comp intake is just starting to "come on line" at that RPM.. Basically, you can...
  16. R

    Diagnose 1st Replace parts second

    All well and good, Rick.. I agree with that sage advice wholeheartedly.. So many people just start throwing parts at a problem, hoping something will stick.. All us experienced mechanics know that's the last thing to do.. But the advantage those professional mechanics, both active and retired...
  17. R

    No dash lights

    23.7 mV is nothing. Did you check both sides of the fuse?? You can check this with the fuse installed. There are 2 metal "tabs" visible on the fuse on each side of the fuse rating number. Voltage on only one side means the fuse is blown. If you have voltage on both sides, look for a loose or...
  18. R

    Body Mount Hardware

    Is this what you're looking for... https://www.classicparts.com/1973-80-Cab-Mount-Kit-C10-2WD/productinfo/35%2D161/
  19. R

    Front posi-traction differential

    Just because you CAN do it doesn't mean you SHOULD do it....
  20. R

    Front posi-traction differential

    Not a good idea.. Makes for some awkward steering leading to loss of control, especially on wet roads and when turning..
  21. R

    thoughts on low vacuum?

    Longer duration, additional valve overlap -- all lead to low manifold vacuum.. Cams of this design tend to make their best power and torque in the upper RPM range..
  22. R

    Want to build a good horsepower, good fuel economy engine for a 1978 c20 with stock 350. I don't know much and need help.

    This begs to be discussed, but no one has posted a comment along those lines.. The following is only my opinion but should be considered... One word: WEIGHT.. Personally, I would never consider a 3/4 ton when designing/building a performance vehicle. They're just too heavy. A 1/2 pickup is...
  23. R

    What to keep? Sbc questions

    Matt, speaking as a potential buyer, there is still some interest in the SBC blocks.. Unless the block is destined for some serious displacement mods, there's not much difference between a 2 bolt and 4 bolt block other than "bragging rights".. I've built 2 bolt blocks for racing applications...
  24. R

    Want to build a good horsepower, good fuel economy engine for a 1978 c20 with stock 350. I don't know much and need help.

    Let's get the terminology correct so we understand each other.. It's not "rpm gauge", it's tachometer.. Now to answer your RPM question.. I've been building engines since the late '50s when I was about your age.. I raced cars and built race engines for some of those years.. I can listen to an...
  25. R

    No start, no lights…

    Remove and clean both battery cable terminals and battery posts,, Sounds like you might have some corrosion going on. If this doesn't fix things, then load test the battery. If you don't know how or don't have the equipment to do this, places that sell automotive batteries can do it for you...

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