98 115 spl had a prob. with charging did all the tests and needed a rectifier, replaced it but only had 2 yellow wire and 1 red on the new one hooked it up and now i am charging 16 volt at wot. is this to much?
It will probably level out to around 15 volts or a little less once the battery is fully charged.
I have a digital volt meter on mine and have seen it hit 16 volts at WOT but it drops back down after it runs for a little while.
Good, bad or otherwise, 16 volts is common on an unregulated system. Actually, putting it in perspective, that's only about 1.5 volts higher than a regulated one.
I had that same issue on my '96 112 SPL. Put a 12 amp regulated regulator on it. Costs like $30 and back to 14.5v. Mine was going upwards of 18v and reeking havoc with my electronics.
Make sure your battery is good. I had the same problem and I changed the battery and now it doesn't go above 14.2V even after a 30 minute ride. I guess bad batteries will overcharge.