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You will need either an external power source - like a jumpstarter or a charged battery or you can use another car from a friend or relative along with jumper wires. \You will connect the jumper wires from the external source or the other cars battery to your battery.
Pay attention to the polarity.
Take your battery in for testing after charging it. Then, to avoid pulling the Alternator for nothing, drive to a local Autozone, Advance, or Oeilys and ask them to check your charging system on the Van.
Consider taking an extra battery if you have one to fit, so you can get back home after the test. Run the van with the charger connected until you get good heat, then reduce the blower fan speed to minimum. Then disconnect charger.
If you are still stuck on the road, jumpstart the van until it is warm, using the jump car to charge the battery so you can go home and try again. Just leave the battery jumpers connected to the struggling van battery a few minutes so the old battery has a chance to charge.
You can charge the unit either with the 230V DC adapter plugged into your wall outlet or by using the 12V adapter plugged into the cigarette lighter (assuming the battery is good) of your vehicle.
If you are using the wall outlet, plug the end of the power cord into the charger then plug it into the wall outlet. Then turn on the charger. Disconnect when the red charging LED goes out. (If you press the TEST button, you can find out the state of the battery. After a number of charge/discharge cycles (even when unused), the battery will need to be replaced every few years.)
Replace battery with your choice of 12v products considering physical size, amp range and warranty. Lawn tractor batteries seem to have the least life/duty cycle. There are two methods of charging the battery used by Coleman. One is to charge the battery with charger/alternator coils installed under flywheel of the engine and second is to charge with built-in circuit in generator itself. Examine your wiring diagram to discover which you have. Simple test with volt meter will show if system is charging. Test voltage at battery with engine off, then start engine and retest looking for slightly higher voltage indicating charge. The charging system is like a trickle charger and not like your auto with initially high amp charge then taper to minimum. If your run your generator for long periods of time and you feel that the battery is being overcharged, then rig a switch to stop charging after one hour or longer. Good holiday
One thing I have found with the ryobi 18V batteries in particular, and cordless tool batteries in general, is that if the battery is completely dead, the charger simply will not recognize it. This is referred to as a "threshold level" by some manufacturers. One solution that has worked well for me in the past is to take a battery that is known to be good and has a charge and use small jumpers to hook it to the problem battery, terminal for terminal, for about 1 to 1 1/2 minutes, much like jumpstarting a car. Then place the problem battery back in the charger and more often then not, it will take a full charge. Wear safety glasses any time you're messing around with batteries, because although the risk of explosion is minimal, it is still a risk.
If the system will not power on, and the LED on the AC adapter goes out when plugged into the system, then the most likely senario is the motherboard has failed. Remove the battery, Wireless card, Drives, RAM and connect the AC adapter see if anything changes. If no change, the MB is most likely bad.