/ Leisure battery not charging
Radio needs resetting every morning and comes on by itself. I believe it may be wired to leisure battery for watching dvds when parked. Could this be cause or effect?
Any suggestions of where to look next welcome? Is there a way of checking relay in case I have replaced with faulty one?
is the leisure battery charging ok via the mains, off the van?
a knackered battery can still show almost 12v.
Disconnect the leisure battery and confirm that there is 0v showing on that side of the relay. Start up and verify there is charging voltage on that side of the relay. You might here it click too. If the relay is working ok then the leisure battery must be buggered! The radio would reset if there wasn't enough voltage. Or the radio may have some odd fault that's discharging the battery. Not unknown.
I think batteries can also get fickle in the cold, I assume this has just started happening ?
Typical bat is 100ah
Should only be used to 50% SOC or DOD
(SOC = State Of Charge. DOD = Depth Of Discharge)
12v fridges use about 50ah per day
Recharging a bat is not just about replacing X number of ah. Lead acid bats need Time as well as ah to recharge. To get back to 100% SOC takes a long time. Failing to do so allows sulphate to build up which reduces the total capacity of the battery. With each cycle the battery gets smaller & the DOD larger for the same usage.
So unless your engine is running for over 8 hours per day the fridge is on it will be getting hammered & eventually stop working.
Did you try Digby's suggestion of disconnecting the bat & testing the voltage at the terminals with & without the engine running?
Is the relay a volt sensitive relay? If so it may not charge the leisure battery until the starter battery is full.
If the starter battery is duff then the leisure battery won't be charging and may also be helping the starter battery in starting the engine.
That's all from rusty knowledge on how split charge systems and vsr 's work.
Do you have a circuit tester? As suggested isolate everything, give both batteries a good long trickle charge up to 12.6 v and then have a good test of the voltages in each part of the system.
Good luck! Let us know how you get on
The wire from the starter to leisure battery should have a relay interrupting the connection between the two batteries when the ignition is off,
There is no isolation built into the cf9 hence an additional relay is needed.
An average fridge draws about 4A so will flatten a leisure battery pretty quick as mentioned,
I'm very familiar with these systems and work as a car security/ audio/ motor home engineer,
Have u got access to a multimeter?
Defo missing a relay! And need to locate the drain on leisure battery side
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