4 replies [Last post]
808Airhead's picture
VBMWMO #7677
Joined: 08/05/2009
Posts: 1015

Aloha everybody,I have a 12V alternator "drop in" setup from Benchmarkworks,it came with my 1954 R67/2,this setup lists for $575.00 not including all the bulbs,etc.,and will fit the 17mm TAPER,not the later 20mm taper cranks,so it is for plunger or EARLY Earls fork. It has bright lights,and loud horn,but on long drives,in the daytime it has boiled my battery,and this is the 2nd battery I have had to buy and just want to go back to 6V. I might be using a battery that is not large enough in capacity,I don't know,but if someone wants to convert to 12V this is the setup. I will trade straight across,for a COMPLETE 6V system with new bulbs. This alternator system has 1300 miles on it,and will come with ALL the 12V bulbs for plunger bike. If you go on the benchmarkworks website,under engine electrical you can click on the alternator for $575.00 and see the pictures and directions for this setup.

Email me @ taivw@hotmail.com send some pics of the generator you have,and it has to have clean commutator/mint condition for me to trade. Mahalo!


Thomas M.
R69s - R60/2 - R67/2 - R51/3

c8h18's picture
VBMWMO #8382
Joined: 10/14/2012
Posts: 92
Alternator Set Up

I've been riding the 12V alternator set up from Vech for over seven years without a problem. I use a 12V Bike Master AGM battery and have never had a problem. It's a great system and easy to install. Sorry it did not work for you.

stagewex's picture
VBMWMO #8810
Joined: 10/26/2014
Posts: 467
I have the PowerDynamo and

I have the PowerDynamo and never a problem. !2volt AGM (in a dummy 6V case).
I'm trying to understand how your system (which a bunch of folks have) would boil your battery?

Anyway, PowerDynamo is great and so is 12 volt on these old girls.


mike wex/stagewex
1969 BMW r60/2, US Model, 1995 BMW K75, 2006 Yamaha TW200, 2007 Ural Patrol, 1991 Honda XR250L

miller6997's picture
VBMWMO #6997
Joined: 10/27/2006
Posts: 1046
No problem

I installed the 12V conversion that Vech provided. I've had the same battery for five years. Between rides, it's always on a Battery Tender.


Jon Miller
'67 R69S
'13 F800GT
Altadena, California

wa1nca's picture
VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 451
Voltage regulator

Bad voltage regulator ?
Max output should not be more than 7.4 volts
Also good to have headlight on
Have you talked to Vech about this problem



Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

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