Hi Mark, and welcome to the Forum.

Check out the MC21 wiring diagram in the Workshop section to see what the splice actually does.

It sounds like you may be splicing the "wrong" end of the orange/blue into the black/white wire. In standard form, the O/Bu wire goes to earth (ground), so when you cut it you need to splice the end at the PGM connector to the Bk/W.

If you splice the O/Bu at the harness side to Bk/W you will create a dead short, and that will blow a fuse.

I hope that makes sense...
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Andy.
NSR-WORLD.COM

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