tusticles
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Wow! Thanks Steven. I greatly appreciate you taking the time to look over that and map it out. It's a rainy day today and tomorrow here in San Diego so I'll look in to those Tuesday afternoon or Wednesday and report back what I find with either corrosion or wire quality level.
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REST ASSURED EVERYONE... I found a loose fuse connection. Old fusebox connections are weak so the fuse wasn't tight. Explained why it worked earlier and then not again. Still going to buy a new headlamp, because the hi beam is burnt, but will see what happens with that as well. Thanks everyone for your help. Gosh, I feel real silly.
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Here's what I've been using off a google search. Unfortunately, I don't have an official one, nor seem to be able to find one for 78' xs750se. You're able to find the one that I'm using if this is poor quality for you by googling "1978 xs750se wiring diagram" and clicking images. It's the second one as the first one is for an 850 I believe.
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I could see a PO re-wiring something if needed. Are you familiar with where the head lamp wire is ran to? I can't seem to locate the Reserve Lighting Unit on this bike. Alright, so I just got the bike to my wood shop for a nice flat quiet place w/ tools to test more. On the way here, the lowbeam workedfor 98% of the trip! When I parked, with the engine still running, the light was off. I gave it throttle but it remained unlit. I also, for the first time to my notice, saw the "Head Lamp" light on the dashboard lit up. I brought it inside and re-did some voltage tests to the headlight hi/low AND retest the battery voltage both at idle and throttle, and these are the results Battery : - idle - 12.92 - throttle - 14.2 Headlight : *Results are respective to whether hi/low beam switch was engaged. Low Beam : - idle - 13 - throttle - 40 Hi Beam : - idle - 14 - throttle - 45 Still head scratching, especially that I just experience the headlight working. The battery, with throttle reaching voltage over 14 is alarming, yes?
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I did not recheck the voltage at the headlight at the same as I was getting the battery readings. I can do that. It's definitely requiring some good pondering. The last thing that the ElectroSport sales manager said was "You have to have either A) a bad reg/rect combine with a flaw in the wiring, or B) just a flaw in the wiring. Your problem also seem to be intermittent, which is not typical of regulator failures. Once the regulation circuit in the unit goes out its just dead from that point on all the time. Your unit seems to be successfully regulating now during the recent test, makes me think something is wrong beyond the reg/rect. The headlight should be getting power from the battery, there should only be one voltage for the entire bike's electrical system because all the power is within one shared circuit. Where does your headlight get power, because if its voltage is not equal to the battery then that power is not coming from the battery."
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DC Volts
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At idle the battery reads 12.7 and with throttle it doesn't go above 14. stays around 13.8 - 13.9 volts.
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The meter appears to be functioning correctly. Reading 12.6 volts on the battery. Thanks BlueSky! Good validation in the bad R/R
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Hi everyone, I've got a 1978 xs750se and after replacing a bad regulator rectifier with a ESR310 from electrosport.com**, I noticed the headlight stopped working. I put a multimeter in the connectors of the headlamp wiring plug and both low beam and high beam are registering 16-17 volts at idle and upwards of 28-30volts when throttle is given. I imagine that this blew the headlight. All the other lights, turn signals function properly still. Think this could be a bad (new) regulator rectifier or there's a wiring issue somewhere along the way? Thanks for your help! It's brutal not riding because of not having a functioning headlight. I've contacted electrosport to inquire about the issue and a possible bad RR but would love your input as well. Thanks.
