Wiring comments needed

[Crave1957]

Hello everyone,

So this winters project is to update the boats messed up DC engine wiring and consolidate three switches into two. This is what I have arrived at so far. I am looking for impute and comments before I move forward. The lengths listed are estimates only and will actually be shorter. I am looking for comments and any suggestions/ideas. At best I am a beginner.

If you click on my link to photobucket below it should take you to my wiring diagram/outline....first picture

Thanks Mike

 

[Newman]

First comment is to do actual load calculations so you don't undersize the wire. I would think the draw of the starters would be available online. You don't want to oversize as you can spend a ton of money. Wire is expensive now if you haven't noticed.

1) I don't see provision for the alternator on motor 1. Never had a twin setup so I'm assuming it has one. If it does not I would not want the load for charging bat 1 to go through the switches.
2) What does the red wire connecting the two switches do? Is that the connection for the emergency start?


I know not much help but maybe the questions will help others determine the answers. Out of curiosity... Why happened that the current wiring needs replaced? Lots of splices?

 

[Crave1957]

Ok, yes I understand the wiring and load calculations issues and I will reuse some of the existing wire if it tests ok. Starter draws seem very hard to find. I even called company. But, I have idea of amperage....which is momentary I believe...which why hard to fine
Answers:
1) the alternator on engine one is routed to/thru the starter and can stay that way i believe. This is preferable that way I do not have to unwrap the harness to wire it straight to the battery. On engine two this has to be done to charge house batt directly. It is going to be a tough move because that starter is very difficult (GM 5.7/350) to access.

2)The red wire parallels the batteries for the "both" position.

3) current set up is old and just not practical with three switches and all. In addition to no common ground and lots of wire going directly to battery posts.

Thanks Mike

 

[Newman]

It sounds like you have handle on it then. Glad I was of no use! :grin:

I see you are going to use a common ground, we use them in our telecom rooms to tie into building ground for all the equipment racks & panels. Which leads me to a question... Is there a marine buss bar? I would think for use salty boats there would be some sort of protection to keep it from corroding. Curious again; I'll have to look that up.

Good luck Mike and I hope there's lots of reusable wire.

 

[Crave1957]

Nope, I need to be questioned seriously.....makes me think it thru
Thanks

 

[Crave1957]

Other comments impute needed