Hello
Fuse does not blow until bike is running a few seconds. When ignition is switched on and kill switch is turned on all is good...the bike starts as normal, runs a few seconds then blows the fuse. I removed the power commander V and it runs as normal but that could just be because some wires got moved...guys where do I start

 

Try putting the PCV back on and see if the fuse blows again. If it does the PCV is probably bad. If it doesn't you have gremlins.

 

larsfum's idea is a good place to start. Other than that gfriend it's always good to state the year and model of bike you're working on. This site is great, go to the search tab, type in what ever year your bike is and style, eg 2014 Touring, then look for wiring diagrams.

https://serviceinfo.harley-davidson....uring&id=56344

 

Disconnect ECM and check resistance between wire and ground.

 

Update PCV is out of the system...fuse no longer blows but I am getting no spark on front cylinder..plugs replaced swapped wire and it works on another bike... Coil ohms out good but since primary is so low I am going to check it on another meter sorry guys bike is a 2008 softail deluxe

 

Replace the coil and she is alive!!!

 

If you swap wires and the dead cylinder swapped it cannot be the coil.
Bob

 

Coil primary measured .3 on rear .2 on the front.....new coil measures .3 ohms front and rear all is good...