Originally Posted by andyhardy

Scotch locking should only really be used for testing something out or a temporary fit. If it's going to stay permanent then you should solder it.

To help with your problem though - have you measured the current draw for whatever the green wire is feeding and then checked what the current draw is for this new light? It sounds to me like you're drawing too much current from the power line.

Have you thought about wiring up a cable from the battery through a relay and tapping into the cable to switch on the power from the battery?

As said - solder the connections in the future, it's not that difficult to learn how to do and if you get a gas iron you can do it without the need for extension leads.

Cheers,

Andy