Speedmaster Efi Blew Fuse/ Won't Turn Over After Changing Lights

Hi all, hoping someone might have an idea as to what's going on here!

I have a 2014 Speedmaster and I am building a new LED rear light/indicator block.

I unplugged the old one (an ugly aftermarket LED thing the previous owner had put on) and connected up the new lot, turned the ignition on, the indicators and brake light were working fine but no rear running light. I thought that was strange, went to start the bike and it just clicked, wouldn't turn over.

Checked the fuses and fuse #8 - 5v - had blown. Put a new one in. Tested the battery, that seemed ok. Reconnected the new lights and exactly the same problem, no running light and no turnover.

Rear light wires are a simple black, blue and red, which matches up to the new light, tried swapping the red and blue over to see if they'd messed up the colours on the new light, and if I have blue to red and red to blue then I get the running light and the brake light all working fine (also tested this with the old rear light and works the same). Also won't start with the rear light/indicator completely disconnected.

Somehow I blew the fuse, may have touched the wires together or touched the frame or something by accident. So what could be stopping it starting up? it's like its immobilised – is that possible??

Sorry for the lengthy message but I've tried to give as much detail as poss!

View attachment light.jpg

 

Problem solved, the battery had dropped to 11.7v so although it all seemed fine with lights etc, it would just click and not crank.

 

Yeah. My first thought was the battery but it felt too much of a coincidence to be that while I was messing about with wiring and fuses so thought I'd done something wrong. Should have tested the battery voltage straight away!