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It is important to know what is going on inside of a vehicle. The headlights dim when a stereo is turned on or turned up because power is being drawn away from the lights to the stereo.
The fan comes on when the temperature of the engine reaches a set temperature as you say. The fan will also come on and stay on as soon as the A/C is turned on. Other than those 2 methods, you cannot manually turn it on. There is no reason to do so. The fan's job is to keep the engine from going above a set temperature, and nothing more. No need for it to run any other time.
LED headlights are much brighter than normal headlights. Yes, if you see much brighter headlights on a car, they are most likely going to be LED headlights.
We are going to need to know what engine it has.
it means that your going to fast to stop when something comes into the view of your headlights.
You may see the headlights and dash lights flicker at an idle. You may hear unusual noises coming from the alternator when the engine is running.
It's not supposed to be on. It comes on when engine reaches certain temperature. But if you see that temperature gauge is going in the red area you need to check the fan relay, its fuse, and the temperature sensor.
It turned out to be the alternator going bad. Replaced alternator. No more growling.
We are going to need to know which gasket you speak of, there are several.
You more than likely need to replace the headlight switch. Lights not going out when turned off is a symptom of a bad headlight switch.
The headlights go up and down when you turn the headlights on. If they are not going up or down they may be disconnected from the motor. You would have to take the headlights out to see if they are disconnected or not.
One can find more information about motorcycle headlights by going to the JP Cycles website. The website has a section dedicated to information about motorcycle headlights.