A little confused by your logic in reducing fuse 12 rating to only 5 amps now Dave.
Because one of these.....
![[Linked Image]](https://i.ibb.co/M8BfXmP/5a-Fuse.jpg)
Is way cheaper and easier to fit than going through all this again.
![[Linked Image]](https://i.ibb.co/kSh891b/PCB-FAILURE-BURNT-TRACK.jpg)
After including the two Marchal LEDs my calculations definitely show a 5a fuse is the most appropriate value, and my testing supports these calculations, all this suggests to me Morgan’s 7.5a fuse choice may not have been ideal.
We shouldn't blindly assume Morgan got everything right, and however small the risk to my way of thinking a blown 5a fuse is infinitely preferable to all the other failure scenarios.