GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Page 4 in the below manual is for a 3.0 but is the only one found with points. The wiring for your 228 (305 GM) is the same. Color coding of wires is all the same http://www.boatfix.com/merc/servmanl/13/13e4r2.pdf