Split Charge Problem

Sounds right yeah.

Only thing I can think of is the landy sat for just over 2 weeks durint xmas. Only had 2 5 mile drives. The derv heater has an LCD screen thats always on, could have drained the aux batt low enough that the split charge cant re charge it properly.

So next plan is to charge to aux battery as it is a bit low at 11.6v...

bankz5152 said:

Sounds right yeah.

Only thing I can think of is the landy sat for just over 2 weeks durint xmas. Only had 2 5 mile drives. The derv heater has an LCD screen thats always on, could have drained the aux batt low enough that the split charge cant re charge it properly.

So next plan is to charge to aux battery as it is a bit low at 11.6v...

Click to expand...

I didn’t want to make it worse by me rambling on as always ,lol

indeed that’s where I would also start with giving the aux battery a decent charge , is it a leisure battery

Am starting to collect batteries , the exide EA1000 I’ve just taken off and another one the same size, think there 900 Cca and 95 AH

Haha me too! Everyone always asks me to change their batteries and i tend to keep them! Perfect for bench testing kit!

Nope was useful! Sometimes good just to run through it with someone!

Bought a charger off Amazon, will be delivered to work tomorrow and Ill get it on charge asap and charge it again Thurs.

Hopefully this is the issue!

bankz5152 said:

Haha me too! Everyone always asks me to change their batteries and i tend to keep them! Perfect for bench testing kit!

Nope was useful! Sometimes good just to run through it with someone!

Bought a charger off Amazon, will be delivered to work tomorrow and Ill get it on charge asap and charge it again Thurs.

Hopefully this is the issue!

Click to expand...

indeed, always handy

Also have plenty of multimeters , testers etc and indeed if u get stuck ur more than welcome to give me a shout

I use the CTEK battery chargers and must admit really pleased with them seeing they self monitor themselves

Indeed that’s where I would start with a battery charge so u can then at see how long it keeps it’s charge

always happy to help where I can

So I appear to have fixed it

Charged the aux battery today at work, went up happily to a healthy 13.7v.

Tested the split charge and voltage rose with ignition! Wooo

However when I connected my aux fuse box charge dropped

Bit of buggering around and its fine again. After the 1hr 30 drive home the aux battery was reading 13.3v. So thats good to me.

Left everything disconnected from it bar the split charge system. Make sure it gets fully charged up!

Hopefully sorted...

Typical just when I think its fixed...

Working fine past few days then i went to screwfix, clicked on happy days. Then drove back nothing . Finished my day at work, i did leave the heated seat on by accident. Though ive left it on overnight before, pre split charge and no issues!

Thought it would sort itself out on the drive home, nope.

My day driving according to the BM2

The spike about 6am is driving to work

The dip after was me testing the draw of thw derv heater with the engine off.

Next spike was drive to screwfix.

Then you see the drain caused by leaving the hot seat on.



Could it be that the relay has some kind of cut off point? I.e if the aux battery gets below a certain voltage it wont let current flow to recharge it?

Hi mate

see you’ve put the bm2 to good use, see what I mean is such a handy thing to have and can now see what they system is doing

does seem like that relay isn’t clicking back over

would it be worth in disconnecting the relay for a day and then see what happens

just an idea and pleased you found the BM2 useful

At this point im going to buy another relay and try it out. See if it is the issue, if its not ill sell it to my mate whos after one.

Rather annoyed atm!

Love BM2!

bankz5152 said:

At this point im going to buy another relay and try it out. See if it is the issue, if its not ill sell it to my mate whos after one.

Rather annoyed atm!

Love BM2!

Click to expand...

well chuffed u like the BM2 , when I had intermittent faults and by the time I got the multimeter out the fault had gone, or would only do it for a few seconds when driving

plus not bad for a free app

indeed think that’s a good call ref the relay as it does seem something keeps intermittently draining the aux battery and then the relay isn’t switching over to allow the alternator to recharge

that’s if I’ve read it right

Plse let us know how things go and would be interesting to see what the outcome is

Cannot work out this issue.

Something is not allowing current to flow into the second battery.

The live cable off the VSR reads 14v+ every start up without fail. Just wont charge the battery.

Currently got the aux battery hooked up with jump leads to force charging which is fine...

bankz5152 said:

Cannot work out this issue.

Something is not allowing current to flow into the second battery.

The live cable off the VSR reads 14v+ every start up without fail. Just wont charge the battery.

Currently got the aux battery hooked up with jump leads to force charging which is fine...

Click to expand...

hi buddy

have u checked for a voltage drop with the engine running across the leads and also checking the Earth wires

does the main battery need to drop to 12.65vdc before it switches over

Yeah the starter battery must drop below 12.65 with the engine running to disengage the realy afaik. Cuts in when the engines running and starter batt above 13.3

Vsr connected

Engine off is
+ on starter - 12.77
+ on aux - 12.95

Engine on is -
+ on starter - 14.36
+ on aux - 12.97

Vsr disconnected. Jump lead bridging starter and aux +
+ on starter - 14.20
+ on aux - 14.16

bankz5152 said:

Yeah the starter battery must drop below 12.65 with the engine running to disengage the realy afaik. Cuts in when the engines running and starter batt above 13.3

Vsr connected

Engine off is
+ on starter - 12.77
+ on aux - 12.95

Engine on is -
+ on starter - 14.36
+ on aux - 12.97

Vsr disconnected. Jump lead bridging starter and aux +
+ on starter - 14.20
+ on aux - 14.16

Click to expand...

hiya

just thinking , does the vsr suppose to disconnect with the engine off when it drops below 12.65 to protect it from draining and switch over to the aux battery

or wonder if the vsr can go out of range , did this happen all of a sudden

also having fun myself, lol

https://www.landyzone.co.uk/land-rover/split-charge.355203/#post-4754931

Also just seen this ref VSR

The relay is knackered. Cant be anything else.

No continuity from the starter battery to the aux battery when the relay is supposed to be connected.

bankz5152 said:

The relay is knackered. Cant be anything else.

No continuity from the starter battery to the aux battery when the relay is supposed to be connected.

Click to expand...

does sound like it mate , seeing it won’t allow any voltage out and u having to bridge it

Alas I can’t fit a VSR because I’ve got a smart meter so now looking into a DC to DC system, also looking into fitting a solar panel on the roof , so that when I don’t use the landy or go away will at least help keep them topped up

Plse let me know how it goes mate

So the relay is buggered for sure.

For now ive disconnected the VSR and just linked the batteries manually. Showing 14.4v on both batteries and much less voltage drop when using ancileries.

Bloody thing.