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Author Topic:   Electrical Confusion
Accaparant posted 04-19-2008 02:18 AM ET (US)   Profile for Accaparant   Send Email to Accaparant  
Hey guys,

I have a number of questions and I'm a relative rookie so please bear with me. I was reading a few of the posts about wiring and dual batteries. Here goes...

I want to install a second battery on the boat. I have thought about the house/cranking battery option but when try and follow the wiring bundles back to the engine they all seem to go into a harness and I don't think I am good enough to figure that out. So I was thinking about 2 Dual Purpose batteries with a Perko Off/1/Both/2 switch.

Is this the right way to go or should I really have the two independant setups? Then I started reading about ACR's (VSRs) and wondered if I do use the 2 Dual pupose batteries do I need an ACR or not?

JimH (I think) referred to the poor wiring practice of having multiple runs back to the positive terminal. Looking at mine I have 3 it looks like: Bilge, Engine, and Trim motor. How does one go about fixing that? By using a Bus?

Finally, (I'm sorry I am asking so much) if I do the dual battery setup with the perko switch, where do you wire the bilge and trim motor to? If I wire the trim motor to the common with the engine that would make sense in my head. What battery does the bilge pump get wired to?

Any help would be overly appreciated, or if anyone in Western MA would want to come teach me, I am willing to buy lessons.

Thanks again.

Bella con23 posted 04-19-2008 08:33 AM ET (US)     Profile for Bella con23  Send Email to Bella con23     
What boat? What motor? This information would be helpful with placement of batteries, Perko switch, etc.
jimh posted 04-19-2008 08:41 AM ET (US)     Profile for jimh  Send Email to jimh     
There are a million or more boats that have:

--dual batteries where both are the same kind
--an OFF-1-BOTH-2 battery switch
--no ACR
--more than one connector under a terminal post

In fact, the above describes my own boat!

If you don't have an ACR, the battery charging has to be managed by the boat operator. You have to switch from one battery to another to keep them both charged. There is no harm in that if you do it correctly. I prefer to operate the battery selector when the engine is not running. That is the safest.

The exact type of battery you use is not as important as the care you give it, the quality of the battery, and its current capacity.

In a perfect world there is only one terminal under each terminal post or screw, and this is accomplished by using bus bars with multiple terminals. However, if you end up with an extra wire under a terminal post here and there, it is not the end of the world--as long as the terminals are the proper size and type, and a washer and proper fastener are used. Haywire, particularly at the battery terminals, is to be avoided.

Bella con23 posted 04-19-2008 11:11 AM ET (US)     Profile for Bella con23  Send Email to Bella con23     
Accaparant - I hope jimh answered your questions.

jimh - I appologize for the inquiry. I thought I might be able to help him/her out with color coding etc.
Joe

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