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Start with any accessories first than battery/connections and then lights ,cooling fan-and 12v plug and check 4x4 switch and actuator may be hanging up causing a draw
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If you have not done any wiring repairs and this problem has just seemed to have developed , then I am guessing you have a live wire that is touching another wire or bare metal of the frame , handlebars or some wires are plugged into a wrong connection ! You can search the internet for a wiring diagram for your bike and should be able to find one for free ,but it will cost you time ! try a Yamaha motorcycle site where members have open forums or use google images just type in your bikes info model etc and add wiring diagram ! But if you own a motorcycle I would strongly advise you to purchase a workshop manual (it does not have to be a genuine Yamaha manual ) as there are manuals for most bikes and the reality is that you should be able to make a huge savings on maintenance and DIY repairs, adjustments etc and with the full wiring diagram that you can follow and relate to will simplify any wiring problems in the future .
The only logical reason for the wire to become very hot is that there is a direct short to Ground. Either the new solenoid/starter is shorted to Ground internally or the attachment point of the source positive wire is not properly isolated from the Grounding of the starter case.
Find someone with an electric meter, and start with the headlight switch.
Take that apart, and see if there is any electricity getting to the switch.
If there is, then check and see if there is electricity flowing to the headlight from the wire connection on the headlight switch.
If there is, take a jumper wire to the headlight from the headlight switch, to test the wire in the harness.
Be sure, also that the ground wire from the headlight to the ground is good, as a bad ground wire will not allow the light to work.
God bless your efforts.
Well, my first two "guesses" would be either your battery is nearly dead (but still enough juice to power dash lights), or possibly you have a bad ground wire, or bad ground wire connector, somewhere.
Have you verified that there is now power getting to the starter solenoid (i.e.: with a voltage meter)? Is there any clicking noise when you turn the key? Any other symptoms, and did something happen to it just prior to these symptoms.
Clean battery terminals first, make sure ALL wires are clean and tight! Trace the large hot (+) wire from battery to the solenoid, then trace the large wire output (+) from OTHER TERMINAL directly to the starter connection. The starter is ALREADY grounded.
Get a fresh, fully charged battery, make sure the ignition switch is on, handle bar switch in run position. Push the start button. It should at least turn the engine over!! If this does not work, leave the ignition switch on, jump the two large solenoid terminals with large screwdriver, (SPARKS WILL FLY!!) and see if it tries to start USING THE SCREWDRIVER ONLY!..If it tries to start..or does start, replace the solenoid, (disconnect battery first). If not, check battery amperage and voltage!!
electric switch prolly dirty. check fuse , connections ? elect. magnetic sw. if nothing found try a hot wire at closest plugin (connector) to the magnetic sw. (eng off battery disconnected) dont touch and hold the hot wire to conn. just flash it , quickly . should hear the sw make contact. if sw makes you have bad wiring or the sw on handlebars dirty. normally just bad connections or broken wire between bars and sw. let me know how it goes
1. Check all quick connect plugs for loose connections, i have had problems with those before. 2. There may be an in-line fuse also that is hard to find. 3. You may be missing the ground somewhere, check ground connection to frame.
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