Ign. light glows over 3500 rpm

[AndyB]

Coming home from a Lotus Club meet last night I noticed my ignition light starting to come on. From 1000 rpm to about 3500 rpm all was well but in the higher rev ranges it would it would glow to being fully lit but the battery remained fully charged despite the use of head lights all the way home.

There's always something.

[xflow7]

I'd bet your voltage regulator is acting up allowing the charge voltage to go too high. They can get damaged from exhaust heat. This happened on my first one within a couple thousand miles. But my second one has been fine for the last 16k miles.

 

You should get it checked and if necessary replace it, otherwise you may find your battery boiling over, or the regulator eventually packing it completely which could leave you stranded.

 

Edited to add: If you have a voltmeter handy you can check it yourself. Just measure the voltage across the battery as you or a helper revs the engine. If the voltage goes above about 14.5-5V, replace the regulator.

Edited July 29, 2014 by xflow7