Dual Battery Setup 92-96 - Page 3 - Ford Bronco Forum
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post #41 of 43 (permalink) Old 01-07-2017, 07:38 PM Thread Starter
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Ive been thru all that. Im not going to use an isolator.

As for the Fuse, it is required. The Stock charge cable has a fuseable link in it to prevent a fire if it shorts out, so that is replaced by the megafuse.

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post #42 of 43 (permalink) Old 03-10-2017, 03:51 PM Thread Starter
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Quote:
Originally Posted by nelbur View Post
Many alternators can be killed if the charging line is disconnected, as the voltage jumps up and kills the regulator. Some have a current dump to protect the alternator. Check to see if yours can be damaged by an open in the charging line. If it can, I would eliminate the fuse in the charging line. The same goes for your earlier designs where breakers and switches could dead end the charging current.

I am more familiar with dual battery setups in boats. There, the charging line would typically go directly to one battery, and a combiner would be used to combine the two batteries when charging is happening. When the voltage drops below about 13.3 volts the combiner separates the batteries. In your latest set up your two batteries will likely die together. If you separated them and attached a combiner between them they would be independent. A combiner is also called a charge relay. Isolators are seldom used anymore on boats because of the voltage drop they cause and the fancyness needed to correct for it.
The Fuse is required. The factory wiring has fuseable links on the charging wire. You have to use a fuse to replace those. Its been well documented over the years from numerous knowledgeable sources.

The isolator and combiner are not required either. With the high amp alternator and the way I run my vehicle and my stereo, I will never have issues with the batteries getting drawn down, as I only draw lots of power when the vehicle is running.

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post #43 of 43 (permalink) Old 03-20-2017, 01:44 PM
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