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Old May 17th, 2019, 13:55   #27
Clan
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Join Date: Jun 2007
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Quote:
Originally Posted by Simon J View Post
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?
Yes pin 10 has the 40 amp fuse but i daresay there is electronic protection in the trailer module as it will be switched by a transistor device .
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