Head lamp !!!

[SoFloPro]

1975 r90/6

my head lamp went out a few weeks ago, and after i replaced it, twice, i realized there was a bigger issue. i started to notice that when the lamp was on, as i rev the throttle, the bulb glows brighter, my buddy also said he noticed that the tail light was doing the same. could it be the main light switch relay? or something else?

[glennhendricks]

When the voltage changes with the speed often the voltage regulator is bad

[James.A]

A failed voltage regulator kills headlights and boils batteries. On the upside, it is a good indication that the alternator IS working.

[SoFloPro]

thanks for the responses...... voltage regulator huh...? how much could this part cost...? are they available? easy fix...?

[SoFloPro]

thanks for the responses...... voltage regulator huh...? how much could this part cost...? are they available? easy fix...?

[shire2000]

I was starting to have similar issues and then the Alternator decided to go south. So fixed the whole issue by installing a brand new EnduraLast Alternator with Electronic regulator. Best $500 I ever spent. No more brushes to wear out. No more worries about the diode board. Extremely reliable.

[James.A]

It doesn't matter how much it costs, your bike needs a new one. You can shop around for the best price. There is a solid state regulator available, it is arguably a better part. The regulator is under the gas tank on the right side of the frame backbone. 2 hex bolts and 1 three conductor plug.

[Bill Burke]

thanks for the responses...... voltage regulator huh...? how much could this part cost...? are they available? easy fix...?
$32 for a solid state.
http://www.motoelekt.com/charging.htm

[35303]

Euromotoelectrics shows 3 regulators under part # VR-Ext, one of which is adjustable. I second the Enduralast charger recommendation. It gives an extra 100 watts at low rpm power and has been reliable on my R100.

http://www.euromotoelectrics.com

[manicmechanic]

Usually 2 hex bolts, but I recently changed one for a customer that had Phillips screws. It is an easy fix - shut off the gas on BOTH sides, pull the fuel lines off the taps, remove the tank, locate the regulator, remove and replace, put the tank back on, go riding. On a slow day it might take 15 minutes.

[Bill Burke]

I like to disconnect the negative ground on the battery too, when doing electrical work. Eliminates the chance of unwanted surprises.