I hooked them up to the bike and got the same thing. It works its just very dim. It turns off like it is supposed to. Thank you for your reply!So depending on the charge of the one you have laying around, it is going to be less bright. Another factor will be the amount of current the battery is able to discharge, some have what is called an ESR. Equivalent Series Resistance. For automotive batteries, they have a very low ESR or close to none so it can discharge a large amount of current to turn over the vehicle. After that, the vehicle runs off the alternator.
Hook up your lights to your bike, i am sure you will be happy.
I have it wired like that picture except I do not have the "Load equalizer".how did you wire them?
If I had to guess, I'd say they have a FET in there and it's not turned on fully if you float the "+ signal wire". They are relying on it being ground when the signal is off and to pulse +12Volts (which, in this case, turns the blinkers off instead of supplying power to them).
EDIT: and the "optional load equalizer" (catchy name for a resistor) is probably just a 1Mohm resistor to ensure the line isn't floating...