Hello, I am new to the atv forums so I hope this works out. Anyway here is my problem that I hope someone can help me with, I have 1987 250X and last weekend while riding I managed to rip out the wiring harness going to the rear tail light. That wouldn't have been much of a problem but when this happend I am assuming that the two bare wires touched eachother and burned something out because I also lost my headlight at the same time and there are no fuses in the quad that I can find (what were they thinking on that one?) so I had high hopes that someone could tell me what to check or replace because on electrical parts around here you can not return them once you buy them.

 

I am not dissing but are you sure there isn't a fuse? Try a new bulb, maybe a short burned it out.

 

I thought for sure there would be a fuse in there because in the clymer manual I have for it, the wiring diagram shows one so I looked and looked and eventually took the wiring harness right out of the quad and looked it all over and there isn't one or a spot where one should go. In the book it show's a picture of the flat automotive style fuses so it should be easy to find, but of course at the top of the page it calls it a 1987-1988 300X which there is no such beast to my knowledge because I didn't think they started making the 300ex untill they stopped production of the 250X. I took the headlight out and put power to the bulb and it is good so I tested the machine right at the plug and I couldn't get a reading out of it. Because the 250 and the 300ex are so close and a friend of mine has a 300ex I was thinking of borrowing his CDI box and regulator if they are the same to see if I could cancel those two things out which would pretty much leave just the stator or the wiring harness itself. I think the CDI box shoud be the same exept the timing curve built into it, but the regulator may be different because it has to charge that pesky battery. I won't be able to do that till next week, till then I'm going to go crazy every night with it.

 

i did the same on mi 300ex the fuses are unde thr rear seat and plastic on the left side of the air box 15 amp fuses

cover up thr wire wit tape so the wont touch

 

the sry

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under sry

 

Yeah, under the seat on the left side is where the manual shows the fuses being. On a 300ex there are two of them there but on the 250X there are none. I called to the local Honda dealer and he said that most likely that it's the voltage regulator. So it looks like this weekend I get to go steal the one off of Nick's 300 if it's the same, I forgot to ask the dealer, and try that out. As far as the wires themselves go when I saw they were torn out of the light holder I ripped the rest of it out of the wiring harness on the quad and threw it away. I'll make a new one.

 

Well this took a little bit longer than I thought but I finally got it. The regulator was the part that burned up in the mess of things. The one off of a 300EX is a little bit different due to the fact that it has a battery so I had to go order one and hope for the best and that was it. According to Vince, the honda dealer, he said that the reason that the 300 has fuses and the 250 does not is due to the fact that the 300 has a battery and that allows it to have enough current to be dangerous and do such things as catch on fire or have the battery explode. The 250 has no battery and a fairly weak charging system so they were not worried about it having such problems. So thanks for your help and now hopefully if you ever run into the same thing again now you know.