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Old May 17th, 2019, 08:57   #26
Simon J
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Last Online: Feb 15th, 2022 08:50
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
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Related to this issue of pin 9 and pin 10, pin 9 (permanently live) is protected by the 15 amp fuse 77 but is pin 10 (ignition controlled live) protected only by the 40 amp fuse 14? I want to provide a charging supply to the trailer battery that only kicks in once the engine is running. The easiest way to do this seems to be to fit a voltage sensitive relay (VSR) on the trailer to pin 10 and use the output from this (with a 15 amp fuse) to charge the battery. Alternative I could use the output from the VSR to trigger an ordinary relay to connect the output from pin 9 to charge the battery. The latter setup replicates the 'habitation' relay in a caravan but seems unnecessary for the specific purpose I have in mind. Is there any reason not to use pin 10 to directly charge the battery in this way?
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