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Message: [QUOTE="Jim Crenca, post: 924520, member: 22335"] As always, thanks for the input. The harness is each nubbin soldered to a short section of #12 wire; these are then "Y'd" at a bullet splice connector for a reasonably clean parallel conncection. It never occured to me theses bikes are AC; the filaments really light up with a 12 volt DC car battery though. I've posted this question about heat before and I guess nobody ever wanted more output; I did check it with an infared heat gun (with a few minutes run time it got to 160 F.) and thought it might be OK; no soft plastic. I also bypassed the wimpy stock ground wire at the shell and substituted a big old clip lead; no difference. Also of note, the wires don't heat up when powered by bike, battery charger, or car battery so I'm surmising wire gauge is OK. It must be current draw though as both filaments are REALLY dim and just one is plenty bright. Tomorrow I'll try removing the tail light bulb and will make voltage drop measurements. I also want to check the schematic to see if the voltage regulator might be in series with output side of coil and possibly be the limiting factor. Lastly, what forums do you follow. I've got a tech question about helmet tests (from Motorcyclist magazine) that indicates that a DoT helmet may transmit less shock to a rider than a SNELL version. Have you heard about this? [/QUOTE]