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Hey there, I really hope someone can offer me a bit of sagely wisdom. My cb750 is my first bike and I'm still learning the ins and outs of maintenance and repair on it. Anyway, I just installed a dyna S electronic ignition system, got it timed etc etc, running great. I took it out for a ride after i got it timed, everything was fine. I rode it home, had supper and went out for another ride (45 mins or so) Just for the sheer joy of it. After returning from that I went to start the bike for my brother, so he could hear it. I stuck the key in, clicked it over one notch and....nothing, not one bit of power to the lights, gauges, lamps, or ignition button. My bike has its horn hooked up with independent leads to the battery, and it still beeps, so i know the battery is not dead, but does anyone have any idea where I should start looking for the problem? I think its so strange that while sitting safely in the back yard for 60 minuets, that something like this should go wrong out of the blue. Should I start looking at the ignition end, fuses, somewhere else in the wire harness? I could really use some help.
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Administrator
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More than likely it is your main fuse. Behind you left hand side cover there will be a black plastic box. It has a cover so you wont see the fuses right off. It'll be the fuse one up from the bottom. It might not look blown,rarely does,but these bikes are famous for that.
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Hmm, good point. I was looking at the fuses earlier today, and I wouldn't be able to tell if the fuse is blown anyway, because the fuses in the bike are white ceramic, instead of glass. So, if the cb750 is known for popping its main fuse from time to time, then this is encouraging, because at least the repair wont break the bank, after dropping 200 bux on a dyna S. On the off chance that its not the fuse, is there any way to bypass the ignition switch, in order to confirm or rule out the ignition switch as the culprit?
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Administrator
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Im sure it could be done,but I dont know how right off the top of my head. Very likely its the fuse. Most guys replace the factory fuse boxes with new style blade type fuses. They are so bad about popping the mains that its really a good idea. Imagine losing power on the highway at night....no headlight....scary.
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Yeah, I had a similar situation that im glad never came to fruition. When I was loading up the bike into the box of my F150, to take it to an old gent i know who was gonna help set the ignition timing, i go to squeeze the brake as I approach the ramp to the tailgate, and the front brake Master Cylinder blows. Ticked me off at the time, and I needed to replace that part, but of course I am very glad that it blew then, rather than while I was doing a buck-10 (110km/hr) down the highway and some obstacle pop up that required immediate stoppage of the bike. Would that fuse blowing also kill power to the rest of the bike, aka ignition coils etc and stop the engine from functioning or would it keep going? Sorry for the silly newbie questions on bike mechanics, but I would rather ask a stupid question (and a lot of them..) than make a stupid mistake.
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Administrator
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All questions are good questions. And YES,when that main fuse blows it's just like you removed the battery. The whole bike is dead without it.
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Hmm, good to know... Main fuse blows, more or less = God reaching up my bikes rear and yanking out its soul.. Well, Ill pop those fuses out and check em out tomorrow. The opaque ones, could i just hook them into a makeshift simple circuit in order to see if they conduct power at all (light a tiny bulb etc..)? Or would you have any other suggestions to test them? Ill be poking around at this thing right after works done tomorrow. Oh, and I stuck a pic of my bike in the member's bike photo area, if you were curious as to the appearance of my most fickle mistress :P
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Administrator
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You could use a test light to see if there is voltage present. One side to "-" on the batt. and the other to the fuse. One side should be constant 'hot' and light up the test light. If it doesnt light up on both side its a bad fuse.
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Hi, I know this is an old post, but I just had the same thing happen to me.....got to my girlfriend's place no problem....went to leave a short time later....nup.....nothing....no lights, instrument lights, horn, nothing dead as the proverbial.
I was goint to start tearing down ignition switch and working througn the bike, which would probably the lead me to a total rebuild, when all I really want is to ride the thing in this hot weather.
So.....can you please let me know what you found the problem to be and how you ended up fixing it???
Cheers
Pete
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