SailNet Community - View Single Post - Battery Fuse Sizing - How, What...?
View Single Post
  #25  
Old 09-14-2011
Maine Sail's Avatar
Maine Sail Maine Sail is offline
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,539
Thanks: 13
Thanked 149 Times in 115 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Quote:
Originally Posted by josrulz View Post
Thanks Maine Sail. I just stopped by the boat, and found some interesting details:

First, the current alternator "out" wire appears to be a #10 AWG, and it wraps around the block, and then connects to the starter solenoid. From the starter solenoid, there's a 1 AWG cable that goes to the battery switch on the center post.
Typical factory installation..

Quote:
Originally Posted by josrulz View Post
Is there any good reason why the alternator would go through the solenoid, or was this more likely a matter of convenience with the wiring harness?
Only that it is cheap and easy for the manufacturer and when boats came with only two batteries and a 1/2/BOTH/OFF it allowed the user to select where the charge current went. Bottom line it is cheap and easy and builders still do that to this day.

Quote:
Originally Posted by josrulz View Post

Second, my alternator is only 75 amp, not 90. Though by Blue Sea chart, that's on the line between 4 AWG and 6 AWG, so might as well go with 4.
The only thing that hurts by going bigger is the wallet..

Quote:
Originally Posted by josrulz View Post

Third, I can't find a ground wire attached to the alternator that runs back to the ground. I can find a couple wires that supply ground to other things like gauges and the voltage regulator, but it appears that the Balmar is grounded by its mounts. Is this even possible?
Some older Balmar's had a case ground option but most still shipped with a ground stud.. If there is a ground stud on the back of the case make good use of it....
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.


Reply With Quote Share with Facebook