85 700 fuel pump and relay questions
1985 VT700, been hard to start lately, cleaned carbs a souple of times, with mixed success, but fuel pump started acting up. Normally hear the ticking when ignition turned on, varies if petcock opens, but does not seem to shut off in a couple of secs like I hear that it should, so I figured PO bypassed the relay and it did not need the signal from the igniter box. Anyway, went to start it, and no ticking, no start, gas level pretty low. Sometimes get a few ticks, but really sluggish sounding pump. Checked voltage at the pump connector just to be sure, and it's got voltage. Tried to probe connector when disassembled and meter probe slipped out of place and shorted two pins together, made spark, now dead, figured a fuse popped. I looked, no fuse seems to apply to this circuit, all seem OK. What's funny, is that "relay" seems to be there, and with no evidence of "hot wiring" the pump from PO. It certainly seems to be a solid state relay (potted), but what kind of relay has only three connections (if I'm remembering correctly)? What kind of signal does it get from the igniter box, or does the box just send 12v and the relay connects it up? My guess is that it's more than just a relay in there, but how it does anything with just three wires is beyond me. And what would die if the pump shorts in a normal situation? A fusible link, or the igniter box?
The pump itself was interesting, contacts look decent, plunger a little sticky so I grease it a bit and tried it out, and it acts like a short now. At the two coil wires I get just a couple of ohms at best continuity, but not shorted to the housing. Will all but melt wires if given power. Is this normal for the pump? Maybe a quick hit of juice won't heat the wires if it pulls down and disconnects, but I doubt it. Besides, why would it not pull down the plunger with power in any case? I don't mind getting a new pump, but I want it to make sense first. And if it draws so much power, why did wires not melt earlier on the bike? Maybe I changed something upon disassembly, and it's dead now for some reason. Can anyone shed some light on this stuff, maybe answer one or two of my myriad of qusetions? Thanks!
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