Headlights cut out

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gotboost2jz

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Apr 3, 2012
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So I've have my firebolt since April. When I got it the headlights were duller than dull. After research I discovered that the early model headlights wore out pretty quickly. So I replaced not only the bulbs, but the entire headlights assembly with a brand new unit (I found a good deal on one and it wasn't much more than just new bulbs). So it was nice for a while but lately I cannot ride at night because the light cuts out under throttle.
At idle the headlight is bright enough but any type of throttle dims it. Then if I put the bike under normal street acceleration (or more) it is basically out. As in, I cannot see in an area without street lights. So I'm sure others cant see me either. Even when cruising at 3k+ plus I can tell its very dim (but still a little one because i see a dim light run on the road).
Whats going on here? I literally can't see and I love night riding so this is a big hindrance. Shouldn't the bike have a charging loop system (whatever you want to call it) that doesn't drain power away from the headlights when under throttle.
 
Start doing some electrical testing, I'm running a similar problem. Find out what your bike is putting out voltage wise off, at idle, and in the revs. Based on that information you can usually determine if it's Stator/VR/Battery etc.

Manual will do you some good as well.

KC
 
Yes. Your lights are dimming due to a lack of current running through them I imagine which means they aren't getting what they need. That means some part of your charging system is failing which means you're gonna have to start getting readings on different parts of the system in order to figure out what isn't putting out.
 
I get that, but what/where am I testing exactly and with what?
Sorry, I'm a car guy when it comes to mechanics, not a bike guy.
 
Voltmeter is what you need, easiest place to start is at the battery. Check the manuals, it will line it all out for you. Downloadable at the top of the screen.
 
Someone please confirm this as I'm going off assumption only but I think the voltage regulator is what you might mean? If a relay were bad they just wouldn't work at all, right?
 
Check voltage at battery at idle. Should be ~13V. Check voltage when RPM is at 3500, it should be ~14.5V. It most likely is your voltage regulator, but could be the stator. They are both a breeze to change.
 

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