no green wires anywhere on prints

KEVIN D TOBIN

Member
Jun 12, 2018
69
Boat Info
1993 290 sundancer, 7.4L mercruiser repower 2018
Engines
7.4L Bravo ll drive
I have two sets of electrical drawings for my boat one w/2 engines and one w/1 engine which the one I have,I also have a supplement manual which shows electrical drawings for my boat.but not one drawing shows all those green grounding wires,the drawings all show the blk. neg. buss bars but not one green. Is anyone familiar with this and why ?
 
The greens are for bonding. What is bonding? In the most simplistic terms, that someone else will chime in and give you great detail is this:
You have metal parts that are in the boat, and outside the boat. Like the black grounds, that strive to keep 0 volts 0 by running them all to a single point, the green does something similar for non power stuff, like thru hulls, running gear, and the like. The goal is to "ground" all of those objects to a single point, which is usually a plate that sits under the boat. If you don't do this, the metal parts are exposed to stray currents which create voltage differences, and then you get corrosion. I have watched I/O drives literally lose 50% of their bulk in a single season, in a fresh water river. This is not a salt water thing. It's a way to keep the metals and the water from becoming a battery, and corroding your metal.
Standing by to be technically corrected.
 
what I was asking is why don't I see any of these on the electrical drawings from sea ray, thank you for the reply
 
what I was asking is why don't I see any of these on the electrical drawings from sea ray, thank you for the reply


It not part of the electrical system. Bonding is separate system. I don’t think I’ve seen a schematic for the bonding system in any manuals. It would be handy to now how it came out of the factory. Maybe Sea Ray CS could get that for you...they probably have a drawing somewhere
 
I've also wondered why the bonding schematics are not in the owner's manuals. The SR fabrication drawings have the bonding installation drawings.

The bonding system is very important and it is typically one of those electrical systems that suffers from lack of maintenance. The principal is to provide an electrical path to the hull anode from all of the boat's metallic parts and sacrifice the less noble metal (zinc, magnesium, or aluminum) as a part of the natural galvanic process rather than the boat's parts.
There are, however, routing drawings in the owner's manual but no schematic:
upload_2020-7-1_21-18-11.png
 
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