I do not have a switch but even if I did I would not wire as Silver suggest.ĭo not get me wrong as what silver has detailed is one way to do it but there are other ways. There is no way to hook up the field disconnect circuit. However today almost all I/O alternators have internal regulators and outboards also all internal so if you switch thru off with the motor running you blow the alternator diodes or regulator. It kill the power to the alternators field winding so the alternator stops charging and you could switch thru off with out the voltage going so high that it blows the regular and output diodes. The alternator field disconnect switch is used for alternators that have and external regulator. It also allows you to switch to BAT 2 for starting if BAT 1 fails for some reason. The long and short of this, is that the switch allows you to isolate the start battery so you don't accidentally run it down. You NEVER set the switch to OFF with the engine running as it will immediately fry the regulator. If you have high power electronics or a trolling motor which are high current draw components, then you do want to "save" the start battery so you are advised to switch to BAT 2 when running those items. If you only stop for a few minutes there is really no need to set the switch to any position except BOTH since you would not have run down either battery any significant amount. You can actually start the engine in any switch position except OFF. Everything should be connected to the COM (common) terminal on the switch. BUT - if you have anything wired directly to either of the batteries you are defeating the purpose of the switch. When you are ready to go you switch to BAT 1, start the engine, then switch back to BOTH and away you go. When you stop to fish or listen to tunes, switch to BAT 2 so you don't run down the start battery. Then switch to BOTH so both batteries are on-line and being charged. Typical use of the switch is to switch to BAT 1 to start the engine. BAT 1 gets CHARGED (e.g., bucket #1 filled) with the switch in BAT 1, BAT 2 gets charged when the switch is set to BAT 2, and both are charged with the switch in BOTH. The opposite happens when the engine is running. OK, we've covered the USE of the electricity. In the BOTH position, both batteries are tied together to form one great big battery and again, the two batteries power everyting. In the BAT 2 position you have selected the auxiliary or deep cycle battery to power all accessories including starting the engine. In the BAT 1 position, you have selected the START battery to run ALL of your accessories, including starting the engine. You can't start the engine or run any accessories because all electricity is turned off. So - with the switch in the OFF position, the system is dead. Think of the switch as a valve that lets you select which bucket you want to use to power your stuff. In your case, the alternator fills (charges) the batteries. Think of the alternator (actually the charging system) as a pump. Try this! Think of the two batteries as two buckets of water.
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