Jebiruph
Well-Known Member
- Thread starter
- #151
I don't see anyway to quickly separate the batteries on a running vehicle to check the ESS battery voltage before separating them for an auto stop. That's why there is a pre start test. If the ESS battery is tested before an auto stop, you don't need a pre start test.While I don't know that the ESS battery is for sure tested for voltage prior to an ESS event, why would you think it not possible to separate the batteries for an instant prior to an ESS event so that the ESS battery's voltage could be tested? The alternator and main battery on the 3.6L are clearly more than enough to run any electrical needs while this extremely quick test of the the ESS battery's voltage, as you correctly report required in isolation, is effected (hypothetically or not)?
More recent 3.6L JL's which fail the ESS battery test at crank disable ESS as you describe, and take this battery out of the picture (correct?) for the rest of the trip, and things run fine on the main battery and alternator alone, right?
(Maybe I misunderstand what you are talking about.)
I suppose I could test this. I could attach a battery cutoff switch like you use in your setups Jerry to the negative cable that leads from the ESS battery to the main one--initially when the 3.6L cold cranks, with that circuit closed/intact.
My 3.6L is on a trickle charger when at rest. Getting ESS to kick in once it's warmed up shouldn't be a problem. I could then put the rig in park, get out, open the hood, and use this switch to disconnect the ESS battery from the main one and drive some more, coming to a braked stop.
I hope your wrong about only testing the ESS battery's voltage upon cold crank, but if you're right Jerry, I'd agree. The vehicle should die once the ESS event is attempted to be engaged, shutting off the engine with no alternator, main, or ESS battery to energize appliances off of.
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