CL500 Xreg. 70,000 miles. After a flat battery, a problem with this car due to a consistent drain somewhere in the system, I recharged by disconnecting the live terminal, charging up to an indicated 12.7 volts but when i went to start the car for a trip although the instruments all lit up, going to start the engine the only thing that happened was a click from I think the started solenoid. any Ideas, could it be the immobiliser, seems strange that this has happened when fiddling with electrics
engine starting
- Thread starter ayious
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Was the 12.7 volts measured after disconnecting the charger and resting the battery for several hours. If it wasn't then the battery may not have been fully charged. If the voltage is measured while on charge then the voltage to look for is 14-14.5 depending on the type of charger.
This voltage was taken after I disconnected however I did not wait for a few hours as I had been told by my garage the battery was Ok as he had tested it (17 months old) . I just find it strange (after 53 years as a pilot, same number of landings as take offs) that after so much trouble with a discharging over time & same as my old SL 500, that the engine would not start as it always has done in the past, could it be that when I disconnected the live terminal to charge up the battery, that the delay has done something to the immobiliser. it sounds as if the starter solenoid is working as there is a "click" when I go to start the engine. Put it this way, I parked in a bad place and now cannot move the car much to my near neighbours annoyance
I'd stick it back on the charger for as long as you can manage and try again. It depends on the size of the charger but a big 100Ah battery can take as long as 2 days to reach full charge. Still you would expect more than just a click if it had a reasonable amount of charge in it. I wouldn't have thought disconnecting and reconnecting the battery would prevent it cranking unless one of the connections is loose.
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Take the battery to somewhere thay do a free load test on it. (I believe Halfords can do it)
They measure the CCA against the claimed output and can tell you if the battery is failing even when fully charged.
I just had mine tested and the CCA was only half what it should have been. Result, new battery under 5 yr guarantee.
They measure the CCA against the claimed output and can tell you if the battery is failing even when fully charged.
I just had mine tested and the CCA was only half what it should have been. Result, new battery under 5 yr guarantee.
