It seems to be a common issue on our vn750's that the headlight relay fails.
Up until now there was only two ways to remedy this. It was either cough up the cash and buy another used one at a ridiculous price (or for the millionaires among us you could always buy a new one) or you would have to do the relay bypass mod which makes the headlight illuminate when you turn the key on.
I am a firm believer in the bypass as I have used it myself, however, I feel it has to be putting a strain on the other electrical components during start up.
So I have decided to dive into the junction box and see what kind of mess I can make.
So far I have opened the box and tested to see which relay is which and i have found that they are not correctly placed in the diagram found in the manual.
I went out to the bike and plugged the JB board into it.
With one hand on the relays I started the bike and felt for the click telling me which relay was the starter relay. Then I grounded out the fan switch and felt for that click. With two relay positions confirmed then it only leaves the third for the headlight. I started the bike and the headlight stayed off verifying that the headlight relay was indeed faulty.
I unplugged the JB and unsoldered the headlight and the fan relay.
Then I switched there positions and resoldered them in their new places.
Back out at the bike I attached the experimental JB and started the bike.
The starter worked and the headlight illuminated.
Just for fun I grounded out the fan switch and the fan did not work.
Guaranteed relay failure.
Now buying a new relay is out of the question due to the company discontinuing that particular one. So I did some searching to see if i could find a compatible relay and I believe I have found one.
As soon as they arrive in the mail the testing will resume.
Until then here are pics of the JB circuit board.