05 600 SDI relays in the fuse box. 3 spots in the box, 1 on top, 2 below it side by side. Of the two below ,one controls lights and the other seems to power the ecu ? What is the top location for? I have no relay currently in that #1 spot and notice nothing wrong in any opperation of the sled. A twin sled without electric start has relay in this position. Is it OK to put one there as a spare? Because, it is obvious a spare has to be carried. What is a good source for this relay other than dealer? Napa sold me exact replacement off the snowplow parts rack for big bucks and said it is not a standard " ice cube" relay.Anybody know the real story?