16
M1sf3t
7d

Ugh, I could so use a mechRant right now.

Y'all know those legacy code bases you guys are always bitching about that are over 15 years old and everyone that knew how they worked quit ten years ago and everyone since has just been hacking away at it just trying to make do?

So imagine that only the code is wrapped around and between a quarter inch of solid steel and covered with a two inch layer of mud, grease and oil. Was going to replace a faulty key switch, usually a simple job, but when I unplugged it I decided to test the wires to make sure it was just worn and not something major... Every motherf'ng wire had power feeding to it.

For anyone that isn't that up on electrical, the key switch generally has one wire feeding power in and it sends power out to all the other wires dependent on the key position. I say generally because I'm sure somewhere out there is probably an exception, but this goddamn forklift ain't one.

And the more shit I unbolt to see what's going on, the more and more hacks and other fuckery I find. Ffs people if you don't know what the fuck your doing the don't fucking touch it. With all the oil and diesel leaks it has, it's a miracle the whole damn thing hasn't turned into one giant fireball yet.

Comments
  • 12
    FLAMMENWERFER TIME
  • 3
    Sounds like the equivalent of while(true) :-p

    Good luck with your mech, I'm glad I only have to deal with logic and not the risk of electrocution too!
  • 2
    Sounds like the switch is not at fault but it has been bypassed either intentionally or for some other reason.

    Do you know what you're doing?
  • 2
    @electrineer somewhat. I'd know more if I had an actual diagram to go by and not have to dig through all this shit to see where each wire was going. Its not 12v to every post, two are at 11 and one is at 2.

    Unplugged every wire to the fuse panel, still getting 10v there. Checked the valve its grounded next to, same thing so I'm assuming I've got a short somewhere but with the jackasses Ive known to work at this place there's honestly no telling.

    They've got a 1/4in bolt in place of one of the bus fuses and I've found three or four wires already that were just cut and left exposed. So were the post on the main 60a breaker, liquid taped that and it eliminated most of the draw i was getting further back near the battery, but it didn't affect the one on the fuse panel.

    Think I'm about to call it a night tho. Gonna let my uncle call cat in the morning and see if he can't persuade them into sending him a printout from one of there $150 service manuals.
  • 1
    @ArcaneEye if only that were a possibility, maybe these dumbasses would keep their damn test light rolled up in their box. It's only a 12v system pushing 950 amps though so you only get a bit of a tingle if you touch the wrong thing.
  • 1
    @M1sf3t What machine are you fixing?
  • 1
    @M1sf3t wait, doesn't electricity get a lot more dangerous with extram amps than volts? 900 sounds like a lot...
  • 1
  • 1
    @Gregozor2121 a forklift one of my uncle's has left over from his logging company. He went out of business ten years ago and leased it with the building on two separate occasions. His brother and I did some contract work for one of the companies before they found someone they could stomach to pay full time, pretty sure at least some of what I'm dealing was our replacement's handiwork.

    Now that trump has "made america great again" (🙄) unc has decided he wants to give logging another shot with a new skid steer he just signed on and now I've been roped into trying to salvage all the other broke ass shit he has because I have nothing better to do but sit up and "play" on the computer all night.

    Beginning to think it would be worth another 40k at the uni just to get the family off my back and let me study in peace.
  • 1
    @ArcaneEye its only at 900 when there's hardly any resistance. I forget how much the human body has but its enough to step it down to a manageable pain level, even when contacting the battery directly. Tbh though, I really only have an understanding of the basic relationship between the three, I haven't had to do any actual calculations since I finished school in '05.

    Not much call for them when your just troubleshooting a system that was already known to work. Most mechanics get by with just a test light to tell them if the wire is hot or not. At least they do until they run out of wires to cross. At that point they either they start throwing parts at it or their boss calls someone like me to come clean up their mess. When you take on this kinda work for yourself you really don't have the luxury of guessing.
  • 0
    @M1sf3t @ArcaneEye
    In the most places on earth 50V is considered the safe limit for DC voltage. That means it cant kill you if you touch it with both hands. That ampere talk is a tad more complicated. In order to be dangerous, electricity has to flow through your heart with ~8mA worth of current. But it wont flow if the voltage is too small. So in order to die not only you need high enough voltage but high enough current capiability. There are some HV supplies (20kV) that wont kill you because their current capiability is too small and there are some power supplies with huge current capiability (welders ~120A) but they cant hurt you due to their low voltage 30V

    Some industrial welders have higher voltage so watch out.

    Those are the basics of electric safety.
  • 1
    @Gregozor2121 nope, 50 V is for AC, 120 V for DC. Above that it's called low voltage. Below that it's called extra low voltage and it means small risk
  • 0
    @electrineer Ok I could have forgotten the thresholds but the whole meaning is right. Thanks for corrections.
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