Upping the output voltage on a stock alternator 1) may not be possible because of the internal regulator or 2) if the alternator is externally regulated the increased output may damage the alternator. With a charger this is not a big issue, with an alternator trying to recharge a battery, it is. Emergency vehicles (ambulances, fire trucks, etc) that are always connected to the grid and a battery charger and when working always have their motors running and the alternators running can use them because the primary power source is not the battery it is the charger or the alternator.īecause the diode based systems reduce the voltage coming off the alternator, it would be necessary to raise the output voltage of the alternator sufficiently high to overcome the voltage drop caused by the isolator. I believe there are a few applications where diode based isolators are OK, but sailboats are not one of them. The diode based isolators reduce the voltage reaching the batteries, this is a battery killer. If you wire it correctly you will still have some problems. **************************************************************Īll these links come from my collection, which givew you a lot more to read, too:Įlectrical Systems 101 Electrical Systems 101Ĭlick to expandIf you wire it the same way you will have the same problems.
Diode battery isolator relay how to#
Making Sense of Automatic Charging Relays - Marine How To Making Sense of Automatic Charging Relays (2019) What are ACRs, Combiners & Echo Chargers? (by Maine Sail) īattery Switch Question ? and Battery isolator / voltage regulator / batteries The Short Version of the 1-2-B Switch Stuff: Electrical Systems 101 This is a link to the Electrical Systems 101 Topic, reply #2 This is a newer primer for boat system wiring design with a thorough diagram: Building a Good Foundation (October 2016) This is another very good basic primer for boat system wiring: The 1-2-B Switch by Maine Sail (brings together a lot of what this subject is all about) They are the diagrams mentioned by others, I figure it's easier for me to show them to you than for you having to go hunting for them.īasic Battery Wiring Diagrams This is a very good basic primer for boat system wiring: Basic Battery Wiring Diagrams OEM 1-2-B Switch Wiring History Alternator/Batteries & "The Basic" 1-2-B Switch BEST Wiring Diagramsġ-2-B Considerations (New 2020 - Rod finally got around to diagramming what I had done in the above link in 2009 )Īnd you might find these helpful. Everyone seems to have a separate cable from the alternator, with the starter and house batteries connected to the pins numbered 1 and 2 respectively.Īny useful suggestions (please don't tell me to rewire the boat) about replacement and wiring would be greatly appreciated.
Diode battery isolator relay manual#
However, I have not been able to find any manual for this specific Guest model, nor have I been able to find any reference to someone wiring up the isolator in this fashion. I intend to buy a replacement part with a similar capacity. My assumption is that, after 14 years, the battery isolator has failed. When running the motor (and I have turned off the solar charger/MPPT Controller) at about 2000rpm, on the voltmeter I am getting a reading of 14.28VDC at pin 1 but only 12.38VDC at pin labelled A. There is nothing attached to the third pin numbered 2. The house cable goes to the pin labelled A. On top of the battery isolator, the cable from the starter motor/starter battery goes to the pin numbered 1. (There are also cables running to the generator, irrelevant for current purposes.) On the other side of that switch the + goes to the starter battery itself and it is from that side of the switch that a cable goes to the battery isolator.
Rather, the cable from the alternator goes to the starter motor then it runs to the starter battery on/off switch. There is no direct cable from the alternator to the battery isolator. The battery isolator has 3 pins on the top, ordered 1, A and 2. It is model 2430, apparently no longer made. I have located the Guest battery isolator behind the main 12V circuit panel. My issue is that, when running the motor, the house batteries are not charging.
I have 1 AGM starter battery (which starts both the motor and the generator) and 3 x AGM house batteries. Bogart is a 2007 Hunter 45CC equipped with generator.
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