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ATV wont start

3170 Views 24 Replies 5 Participants Last post by  Melatv
I have a TRX 420TM. It wont start when i push the start button. Some background. It needed an oil change. So I changed the oil and filter. It sat around for a while before and after this. When i went to start it, it wouldn't work. It has a pull start so tried that and it worked. So thought it was the battery. Pull start worked several times and i put it in the shed. A while later i tried again but couldn't even pull start it.
Took the battery out, put it on a charger that wont over charge. It tried for a few minutes then said it had full charge. Tested with a multimeter and it was well over 12v.
Put battery back into bike. Still wouldn't start and no lights or numbers on dash.
There is no clicking (on this forum there are articles about clicking soleniods).
Fuses look good.
Head light works - full beam ok
horn works
back light works
Can't pull start it
What should I look at next?
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just noticed the neutral light flicks on then off just as i turn the key on the first time
thank you for the replys.
i think the battery is ok: shows over 12v, charger says full, headlights work - full beam ok, back light works, horn works.
fuses all look ok, pulled them out inspected, put them back in again.
checked battery connections and cleaned them with emery tape, kill switch in correct position.
the neutral flicked on for a split second and off again
fuel might be an issue but it was only off for a couple of weeks maybe 3, and shouldn't it turn over but not fire?

ok, will get battery load tested. Looked for the solenoid, not 100% sure what it looks like, lol, found something that looked the images i googled. one post was coming straight off battery +. Anyway crossed it with screw driver. It did nothing except spark a bit.
The FSM I just got from above link tells me some troubleshooting so i will do that tomorrow - dark here in NZ now.
if it is battery load problem, shouldn't the lights on the dash work but not kick the motor over?
yep :)
have multimeter, will use FSM to diagnose this week
Back again. Can only work on this in the weekend.
Using FSM i tried this:
Troubleshoot electric starter
1 Fuse inspection - all good
2 battery - all good (I believe)
3 Starter relay switch
Does the starter relay switch click? No (it is normal if it does click - mine doesn´t)
If it doesn´t then check relay coil circuits
remove start relay switch 2P green connector
check continuity between light green/black and ground, this was not 0, it was 0.768
If there is no continuity then check
gear position switch - all ok
diode - all good
front break inhibitor switch - all good
poor or loose contact of the related connector terminal
open circuit in the wire harness

How do i test the bottom two?
Any other advice?
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also no voltage at start relay switch 2P green connector = should be 12v
As I said above, the solenoid is not clicking, I presume because it is not getting power to it?
To get to the start button switch i need to take off the front guard.this will take a bit to do as the bolts seem rusted on, job for next weekend.
Also the ground, how do i work out where it is shorting?

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