Since the start of winter my headlights have not worked. When activated in any mode the taillights turn on but not the headlights. The battery is always charged and it is always warmed up. Any ideas?

 

Think back to when the headlights worked before:

If you turned on the ignition switch and the headlight switch with the engine stopped, did the headlights come on?

Or did the headlights only come on when the engine was running, and the headlights dimmed at idle but came up to full brightness at higher engine speeds?

Some quads run the headlights off AC voltage directly from the stator - thus the lights only work with the engine running. Most quads run the headlights of the 12 volt DC power. Brake lights always run off 12 volts, whether or not the headlights run off AC.

We need to find out which source provides power to your headlights first then go from there. You'll need a meter for the next steps...

 

The headlights worked only when running and brightened when the throttle is pressed.

 

Your headlights are powered off AC directly from the stator, though the voltage is still regulated somewhat by the voltage regulator.

The same winding on the stator that powers your headlights also keeps your battery charged. Try this:

1) Start up the quad and run the engine at a medium fast speed. Measure the DC voltage right on the battery terminals. You should read 13.5 to 14.5 volts DC. If you don't then your battery charge circuitry is not working.

2) Start up the quad and let the engine idle. Turn on the headlights. Unplug the voltage regulator (do not rev the engine with the regulator unplugged and the headlights on). When you unplug the regulator do the headlights come on dimly?

If your battery charging voltage is not right, or the lights come on when you unplug the regulator then there is a power supply issue to look into. If your battery charge voltage is correct and the the light still don't come on when you unplug the regulator then it is a switch/wiring issue to the headlights.

Of course I'm assuming you've already checked the headlights to make sure they aren't just burnt out .

 

I checked the bulbs just in case somehow all three were out and they were fine. So, I checked the voltage regulator, It was corroded well. I cleaned it with a wire brush, put it back together, started the quad and turned on the headlights, they worked. I rode it around, came back to the house to get something and when I went to start it there was nothing. The key was in and turn to on. All the safety mechanisms were in their places (brake, back pull rope and killswitch). Its not cranking at all nothing but I could start it at the starter solenoid with a screwdriver (what I do when I forget my key). Any advice for this?

 

I got it to start. A wire from the ignition came apart.

 

I had the same problem with my 125D headlights. It seems they would work when it was warmer weather, but this winter they have not been working until I replaced the left hand switch assembly.

I picked it up from Motopartsmax.com for $19 + shipping. Here is the link: Cookie Usage : MotopartsMaxATV Parts & Dirt Bike Parts, Moped Parts Go Kart Parts, Dune Buggy Parts and Accessories
Ever since the head lights have worked perfectly. I looked inside the old switch and the soldering joints looked like the work of my 6 year old.

 

I have the same issue on my tao tao ata125D the headlights are led there is no toggle on off switch, I have resistance at the headlight itself and resistance at the power supply plug, my tail light only runs when the quad runs but when the brakes are applied the brake light turns on without the quad running and the headlights used to only run when the quad runs but hey just quit working randomly. Thinking it's a wire some where but it is strange that there is current running through all areas. Maybe I need to check current at the actual light fixture? Maybe the LED burnt out? Can LED lights burn out? It quit working within a week of buying it and the company I bought it from will not warrenty anything for me even though I bought their extended warranty services

 

Forget checking resistances, check if you are getting AC voltage to those headlight bulbs with lights switched on and engine running. LEDs can go wrong but are surprisingly resilient as a rule. Your headlights could be from a bad batch. I would threaten the company you got it from with bad publicity, they know it is not worth your while to sue them, but losing business, particularly that "extended warranty" money from other customers, may make them think again.

 

I have em bad reviews already. Tribal motorsports is who I went though. Packaging was horrible too the quad came with the steel crate crushed into it and rubbing on the plastics. They sent replacements but they were the complete wrong things. I even sent them videos and pictures and they still couldn't match it, I gave up on them and just chalked it up to hacks and gave them bad reviews and tell every one don't even look their way. Friendly people behind the phone just not very knowledgeable or somthing