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Another question, I will upgrade all battery cables  to #2 AWG from #4.
Seems like pre made marine cables are available on Amazon for half the cost (or less) of West Marine
Anything to be wary of here?     

ok thanks.  yes ive never seen a pull start switch but it seems to work. I guess thats what he had in his tool box

will dig into the harness tomorrow!
 

Thanks it seems easy to figure out from the parts list
They even state 'wire flex'  where needed
-  mostly 7/8 ID for raw water   and they give the lengths required

1986 - M25

I've been reading the trouble shooting and going thru the process, but meanwhile was looking for clarification on the starter switch itself.



We have a slow cranking issue, sometimes will not crank at all.
New and charged starting battery
We're told one problem might be the starter switch on the panel
It is a momentary pull switch.
I don't know if it means anything but, there are 12 volts going to the switch line side. When I pull the switch to start and have  a meter on the terminal on the other side of the switch, it seems to fluctuate as it tries to crank but only gets as high as about 7 volts. Is that normal? Could it be an internal switch corrosion issue that needs replacement?   I see push button switches on CD website but not a pull switch like we have.

The pull switch is on the far right and the glow plug button on its left

Even if  I dont use the glow plugs (I always do), shouldnt I always  have normal fast cranking?   
   
Thanks

New to us M25 from mid 80s and we plan on replacing all fuel and heating/cooling, raw water hoses which look original.
The CD exact replacement parts prices are giving sticker shock.  $40-50 each hose?
Where do frugal folks source their hoses?