Hello so I have a 2006 Honda Element and I have replaced the starter, alternator, and battery in the last year and have had no problem until now. the connection from the battery to the alternator is good and the main 100 amp fuse for the battery is also good. There was novolts in the black and yellow wire that plugs into the alternator for the voltage regulator and I dont know what that means. It randomly starting working again by moving things around a bit. If anyone could help with this that would be great! had the battery and the alternator tested at a auto shop they are both good.

 

Check under-dash Fuse No. 4 (10A) to see if it's loose. That fuse and the Blk/Yel (IG) wire supplies the ignition input that turns on the alternator/regulator assembly. There could be an issue with the wiring though.

 

Also check both the ground connection fron the battery negative to the block and the one to the body.