Gallery, Projects and General > How do I??

Fork truck help needed

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John Rudd:
Guys,
I think you may find that the charger is looking for a dc supply coming back from the battery....the charger sees a voltage fed into a sensing network that then permits the 'charging circuit' to energise and start pumping juice.....then when the voltage level reaches the fully charged state it switches off....

PK:

--- Quote from: John Rudd on February 09, 2017, 02:28:25 AM ---Guys,
I think you may find that the charger is looking for a dc supply coming back from the battery....the charger sees a voltage fed into a sensing network that then permits the 'charging circuit' to energise and start pumping juice.....then when the voltage level reaches the fully charged state it switches off....

--- End quote ---
Seconded. I've 'fixed' a few 'it won't charge a dead flat battery' faults over the years by trickle charging to some threshold voltage.
Clever chargers measure the start voltage to ensure they don't overcharge a pack with shorted cell. If the initial pack voltage isn't high enough then it locks out.

John Rudd:
If the charger operates the way I suggested, connecting the leads the wrong way round should prevent the charger from doing anything stupid like reverse charging the batteries.....

So, get a dvm, on volts.....connect charger to mains, connect charger to battery and with dvm across try charging but watch the meter....the reading  should give you an idea that its working....you could put a fuse in series with one of the charger leads....( 3 amp fuse should be ok...) to give you a bit of insurance against reverse polarity....

Latly, have the boys in red on standby just in case.... :zap:

Will_D:
I've had a similar problem with a totally flat (like 6V) car battery (12V);

My modern, safe, sealed battery charger won't charge the battery as the charger doesn't see the battery. 6V is way too low.

Trick is to connect another 12 battery in parallel for some time and then apply charger to both, after a while you remove the good battery.

So blag 4 12 car batterys, connect in series then connect to the fork batter in parallel.

Also the 4 in series will test the charger!

HTH

Will

John Stevenson:
The pucker factor is now in the red after reading all the replies.
I think I'll venture into the hay loft and remove a few panels, if that fails I'll re read the posts  :zap:

My first fork truck was bought with two batteries linked out where the guy previous had connected it wrong and blown the tops out complete, and these are big batteries.
A second hand set fetches £500 on Ebay so not worth the risk.

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