Engine battery

campervanannie

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So my engine battery is now showing 11.8 so that’s flat and ot no way to charge it at the moment as it’s difficult to get the battery out my electric hookup does not seem to charge it even though the leisure batteries are full so my question is WILl IT DO ANY HARM just leaving the engine battery flat until the end of lockdown potentially 2 months I appreciate I will have to replace the battery but it’s 3/4 years ld so not too bothered about the cost.
 

r4dent

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At 11.8v battery is border line. Worth while getting a charger from Halfords/Amazon/ etc and setting it up just to charge engine battery. It may not be OK, in a couple of months. The alarm is what usually drains the engine battery.

1610124099376.png


I use a stand alone charger on my car and Moho for a day every 4 weeks or so, during the you know what.
 

campervanannie

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At 11.8v battery is border line. Worth while getting a charger from Halfords/Amazon/ etc and setting it up just to charge engine battery. It may not be OK, in a couple of months. The alarm is what usually drains the engine battery.

View attachment 90882

I use a stand alone charger on my car and Moho for a day every 4 weeks or so, during the you know what.
I don’t have an alarm on my Moho so No idea what drains it other than it’s an old battery.
 

Tezza33

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If you are going to replace the battery anyway I wouldn't worry too much, as said it is borderline now but in two months it will be scrap, not all motorhomes put any charge into the engine battery on EHU but I would have thought yours would
I don’t have an alarm on my Moho so No idea what drains it other than it’s an old battery.
There will still be a small drain from the ECU and radio (to keep the memory settings etc) so over a time it will drop, even quicker with a failing battery
 

campervanannie

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If you are going to replace the battery anyway I wouldn't worry too much, as said it is borderline now but in two months it will be scrap, not all motorhomes put any charge into the engine battery on EHU but I would have thought yours would
There will still be a small drain from the ECU and radio (to keep the memory settings etc) so over a time it will drop, even quicker with a failing battery
It’s on hook up but I don’t leave it permanently on I put it on when leisure batteries et down to 70/80% then charge them back up but as long as it doesn’t harm the van I’ll just put a new battery on when all this shite is over.
 

Philip Tomlinson

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So my engine battery is now showing 11.8 so that’s flat and ot no way to charge it at the moment as it’s difficult to get the battery out my electric hookup does not seem to charge it even though the leisure batteries are full so my question is WILl IT DO ANY HARM just leaving the engine battery flat until the end of lockdown potentially 2 months I appreciate I will have to replace the battery but it’s 3/4 years ld so not too bothered about the cost.
Is your cab cig lighter live when the key is not in the ignition?
 

Tezza33

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I had a cigarette lighter to cigarette lighter jump lead, it doesn't sound very good but plugging one end in to the sockets on the leisure batteries and the other in the dashboard (permanently live) it charged the engine battery enough to start it, I posted about it a few years ago but not seen it advertised since
 

The laird

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Annie I'm sure your van has an engine immobiliser on it think your keys are coded through the bsi unit which means if it's not the coded key it won't start even though you have no alarm fitted
letting the eng battery go shouldn't harm leisure batt afaik
 

campervanannie

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All is sorted now a parcel came today from Amazon courtesy of Phil and after fitting instructions via FaceTime it looks like we are up and charging will go out and checking few hours but so far so good. 👍👍
thanks Phil once again coming to the rescue. 💋
 
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