"Foster, I was trying to find
"Foster, I was trying to find a good picture to post for you. Have to settle for a diagram instead.
Both the solenoid and rectifier mount on the side of the powerhead just forward of the switch box. The electric start kit from Merc contains a pretty good set of installation instructions, I just couldn't find it in my pile of junk.
Anyhow, you will notice a few (mounting holes) on the side of the block that will become obvious once you know where to look - the diagram should guide you to them...
There is however, no really hard/fast rule as to where they should go. I have my rectifier mounted using the same bolt as is holding one corner of the switchbox - just have to make sure at least one of your mounting screws/bolts grounds good to the block (easily checked with an ohm meter).
If you also acquired a neutral safety switch, I have the mounting location diagram for that as well.
A "professional" is someone who gets paid for their work - it doesn't necessarily mean they are good at it :)