I like the VN750, I really do. That is the reason I'm so eager to solve this problem instead of throwing back the bike to the dealer without blinking.
I bought a 92' VN750 last november and I was happy about it for a week...when it refused to start. I've called the dealer, they came and picked up the bike and "worked" on it for 4 weeks and I got it back with the comment "the start engine been replaced". Fine. It was fine for 20 mins cause when I had a short stop at a friend and tried to start again nothing happened. Another call, another pick up and another 4 weeks later they gave back the bike with the comment "we changed the regulator". Fine!
Well....the bike was sleeping in my garage for 4 weeks when I tried to start it refused as before. At that point I got fed up with the dealer so I decided that I have to find what can be the problem.
First guess ofc the battery, I've got a battery charger and after 13 hours the bike was spinning like it was supposed to be. Btw when I bought the bike they said that the battery was "replaced" by a new one which was big time bs.
So I started the bike 2 times in a 2 weeks period and it ended up dead.
I bought a volt meter that I mounted on the bike and it showed only 1 green dot when I was riding the bike which supposed to be not so good. Battery died once again. I bought a new battery yesterday and a multimeter. I decided to go to the deep of the problem. Battery charged, bike started perfectly, idle voltage readings on the battery were 14-14.4V but when I checked between the headlight + and the battery - it was reading 13.5V.
The tricky part comes now....when I spin up the rpm the voltage drops.
It was a bit hard to do it alone to keep the 2 pins of the multimeter at place and fix higher rpm but my guess was that around 4000rpm I had 12.5V. I'm not an uber mechanic but so much I know that this is not good.
Anyone got a wild guess what could that be? Since I didnt have a big enough screwdrived to take off the left hand cover to check a 6 pin connector as the service manual says I have to postprone this action for tomorrow but meanwhile I would like to hear any advice or comment on this, please.
Worse case scenario gonna be a bike through the dealership's window but I try to avoid it cause the bike is quite heavy.