I have an isolator on my bike and glad that I did. One of the wires came loose in the female end of the plug and fried my isolator. Bought a new isolator at the auto parts store with some tools replaced the isolator in the motel parking lot and was on my way. There was no damage to the bike.
The new isolator can be reset if shorted, so I no not need to replace it like the original one. I have been told that the isolator is not needed that if there is a short it will blow the fuse on the bike, but I like the extra insurance against the possible damage to the electrical system on my bike.