moresparks
Active member
Hi hopefully someone can assist.
Is there any reason that the D+ of the alternator should be on the un-switched side of the House Battery Isolating switch?
I have a Volvo Penta engine with 2 batteries:
1/ Engine Start
2/ House Battery.
The Engine Start Battery is fed to the Alternator via a Battery Isolating switch in the normal way via a fuse, Starter Motor then B+ of the alternator.
The D+ is fed to the Instruments and a take off for other 12volt services. A feed is also to the house battery for charging. The Services is the other side of the switch i.e. switched, but I seem to have a permanent 12Volt feed from the house battery to the D+ of the alternator.
This causes a minor drain on the house battery, Apart from not being able to isolate the supply without disconnecting.
The switches are just the standard Battery Isolating Switches with the red key.
My only thought was that originally the boat had a very basic battery charger so this would not have charged the house battery on shore-power if the battery feed was on the other side of the switch. The charger has been replaced with a modern charger with separate outputs.
All other aspects are working just fine like normal charging when the engine is running.
Can anybody think of any other reasons as I am considering moving the supply to the switched side?
Thanks in anticipation.
Is there any reason that the D+ of the alternator should be on the un-switched side of the House Battery Isolating switch?
I have a Volvo Penta engine with 2 batteries:
1/ Engine Start
2/ House Battery.
The Engine Start Battery is fed to the Alternator via a Battery Isolating switch in the normal way via a fuse, Starter Motor then B+ of the alternator.
The D+ is fed to the Instruments and a take off for other 12volt services. A feed is also to the house battery for charging. The Services is the other side of the switch i.e. switched, but I seem to have a permanent 12Volt feed from the house battery to the D+ of the alternator.
This causes a minor drain on the house battery, Apart from not being able to isolate the supply without disconnecting.
The switches are just the standard Battery Isolating Switches with the red key.
My only thought was that originally the boat had a very basic battery charger so this would not have charged the house battery on shore-power if the battery feed was on the other side of the switch. The charger has been replaced with a modern charger with separate outputs.
All other aspects are working just fine like normal charging when the engine is running.
Can anybody think of any other reasons as I am considering moving the supply to the switched side?
Thanks in anticipation.