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So, I just finished replacing the hydro pump on my 312-A, and replaced the gas tank valve, filter and most of the fuel line. I had suspected that the original fuel pump was dying or dead around the time that the hydro went. In anticipation of having to fix *this* problem, I ordered a Carbole 12v fuel pump (I've had one running on my 416-8 for a few months now and it works great. Yeah, I know, not American made, but my budget couldn't handle the ones that are...). Anyway, today I tried starting it and wasn't getting any fuel to the carb so I pulled the lines and installed the Carbole pump up front where the original is. Tapped into the ground for the headlights, and ran the positive wire down along the choke and fuel lines and back past the battery. Here's where the trouble seems to start. On the 416-8, I used a toggle switch for a while for the fuel pump, but recently wired it into the bank on top of the panel circuit board. In this case, after some testing with the voltmeter, I tapped into an orange wire that runs through 2 of the punch-down grooves using a crimp fitting like is used for tapping into wires for trailer wiring. This wire had juice with the key on, but none when off. Works great. Here's a picture of that "tap in" (yeah, the punch-down on the right had come up some in this picture - I pushed it down in again): Wiring is different on the 312-A, plus there was a lot more crud (and apparently, corrosion) in those punch-down grooves. I cleaned it with a wire brush and an old toothbrush, then did some testing. Looked like the red wire in the second position from the right (looking toward the back of the tractor) was hot when the key was on, but there wasn't enough slack to use a crimp fitting on the wire as it was, so I pulled the wire from the punch-down and used a wire nut to "three-way" it with the positive lead from the fuel pump. I put the third wire from the wire nut back into the punch-down position. The fuel pump does now work, coming on when the key is turned on, and the engine runs. This wire, by the way, is the red one that goes to the key switch. HOWEVER, a bunch of other stuff doesn't work now. Nothing on the indicator lights panel works, and the headlights don't work (they did before... taillights are still disconnected because rear fender is still off). Interestingly, the hour meter *does* work, at least, I can hear it ticking. But I also noticed that even if I pulled the wire back out of the punch-down, the fuel pump and hour meter still run so obviously they have power without the circuit board coming into play... not really a surprise on the part of the pump since the wire is the hot lead from the key switch. Honestly, I'm not sure if anything on the circuit board (the indicator lights or the test switch) was working before all this. I don't think I ever used the test switch or saw any lights come on there, just didn't notice. So I'm thinking that 1) my circuit board was already dead before all this, or 2) I destroyed the corroded contacts in the punch-down slot when I tried putting a wire back in it. Looking with a magnifying glass, I don't see any metal contacts and there was no penetration into the jacket of the wire when I pushed it down. Here is what that all looks like, voltmeter probe pointed to the punch-down slot: I even tried stripping the end of the wire to see if I could get any contact and response from the circuit board, but... nothing. I just did a quick look on the Googles to see if there are boards available and didn't find much yet. I did notice a thread on this forum from 2012 about re-manufactured boards and even a replacement with an LCD digital dash (very cool). Wondering what your thoughts are, and what the recommended approach might be to fixing this, and what the implications are if I just ignore it (engine runs, but obviously those indicator lights come in handy at times). This wouldn't effect the functions of the seat switch/engaged clutch ignition cut-off or anything like that, would it? Heading to bed now so I won't be responding tonight, but any advice is surely appreciated. Thanks -Dave
