ive got a 98 yamaha warrior with electrical problems.in nuetral it idles fine & the light is there. when i rev it more @a certain rpm the nuetral light starts flickering, rev some more & itll go out.while im riding @ low rpms or high 1s( its hard to tell whether it does it especially after going fast through a puddle)itll start to cut out even though im on the throttle so bad itll stall itself or suddenly itll jerk into going again & itll keep doing this unless i grab & release the clutch & thatll fix it for about 5 feet before i have to grab it again.1 time i had it nuetral i was onthe throttle & it cut out & stalled itself.a little while ago  my headlights got dim all a sudden so i shut them off but my taillight was still on(its not supposed to b).then @The very far corner of our property the baateery shorted out & we tryed popstarting it but it wouldnt so i charged the battery went through a bunch of electircal wires taped some bad 1s that might of been causing problems & when i put it back together it ran fine again.amyway, when it cuts out , after it sits for a while it will run good again. i noticed that it usually starts cutting out @ the end of long trail rides i took it to its 1st race (a really wet muddy 1)on the 21st & it never cut out but now it cuts out regularly when i ride.my dad is good with vehicles but we'll spend hours trying to figure out the electrical system & not learn anything except the factory wiring diagrams r SERIOUSLY messed up!!(they r nothing like it really is, they dont show what happens inside relays & they show the wrong color wires from what i have, & it not cuz some1 changed the wires on my quad.anybody notice problems w/ the diagrams besides me?) anyway w/ the nuetral light the wire goes down to a spot below the engine & it works when it wants to so possibly the nuetral light could flicker cuz of vibration from the engine? i m also not sure if the relays might b a problem, 1 is cracked so we cleaned out dirt & taped it so none more can get in. i could buy new 1s but im only 14 i dont have a job & almost every dollar i make goes to the warrior anyway. maybe the problem is really simple but i cant figure it out do any of u know what could b wrong?!? i've listed as many symptoms as i can. PLEASE HELP ME!!thanks.  

First thing i would do is go to ebay and buy another wiring harness and all the relays i would need to rewire the bike.Ebay is over run with good warrior parts,but be careful about the sellers feedback rating,some guys sell alot of junk.Hope this is helpful,foreman 500. 

If your Dad is good with fixing vehicles, then he probably has a digital multimeter (DMM).  If not, you can get a cheap-o for less than $20, then search Google on how to use one.  It probably also comes with instructions.  If you don't have one or don't want to bother buying one, then forget reading the rest of this, because you can't diagnose electrical problems without a multimeter and knowledge of how to use it.

-Take the DMM and set the dial to measure DC volts.  Put the black test lead on the negative battery terminal.  Put the red test lead on the positive battery terminal.  What does the DMM read in DC volts with the key and all other accessories off?  It should be around 12.6 volts.  What does it read when the engine is running and the trans in neutral?  Should be higher than 12.6 volts, so the charging system can actually charge the battery.  Rev the engine up and watch the multimeter to see if the voltage reading changes.  It should remain steady.  If it fluctuates, you probably have a bad voltage regulator.

-Find the kill switch and disconnect it.  Use the wiring diagram to help you.  A kill switch with an intermittent short will cause problems like you have described.

-I don't know where the relays are on a Warrior, but let's play devil's advocate here and say that if you have cracked a relay housing, then there's a good chance you hit a tree or something with the ATV pretty hard at one time or another.  That means there's a good chance that you have also pinched a wire somewhere against the frame, shorting it out.  The vibration from the engine running and vibration from riding around causes the shorted wire to vibrate on and off the frame, causing intermittent running problems.

-"went through a bunch of electircal wires taped some bad 1s that might of been causing problems"  You mean you had multiple wires that were damaged?  Not good.

-The way to fix electrical problems is by systematically eliminating one section of the wiring harness at a time.  Inspect it and check the resistance of each section with your multimeter.  If resistance is abnormally high, then there's probably a chafed wire or corrosion on a connector somewhere.  Check for loose/corroded connections, especially ground connections.

Sorry to hear your quad is messed up, guy.  Electrical problems can be a pain, especially intermittent ones.  Use a multimeter to find where the problem is.  Poking around here and there and throwing parts at it gets expensive real fast.

Brian