Drained Battery, Any jumpstart tips??

[mazeppa]

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From Jebiruph post per the PDC label:

Now it appears to me jumper a disabled 2018 ESS Jeep that will not start because one or both of the two batteries are too low of a capacity to start the disable Jeep ; is to hook up a + supplied jumper end to the + battery terminal of the disabled Jeep , then by some means jumper across the + battery terminal and N1 (AUX BATT) in the PDC of the disabled Jeep, and then hook the – supply jumper to the frame of the disabled Jeep.


Earlier I thought from watching the Jeepinformant videos N5 would be the location to jumper from the + battery terminal while trying to jump a disable Jeep. Now it appears N5 is the same as + battery terminal that is also the same as N2 as long as the 60-amp fuse in the fuse bar is not blown (open).


I do not know WHAT DAMMAGE may occur to the disabled Jeep when jumping across the + battery terminal and N1 when the Power Control (ESS) relay is not requested to be engaged making the two batteries in parallel.

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[DanW]

From Jebiruph post per the PDC label:

Now it appears to me jumper a disabled 2018 ESS Jeep that will not start because one or both of the two batteries are too low of a capacity to start the disable Jeep ; is to hook up a + supplied jumper end to the + battery terminal of the disabled Jeep , then by some means jumper across the + battery terminal and N1 (AUX BATT) in the PDC of the disabled Jeep, and then hook the – supply jumper to the frame of the disabled Jeep.


Earlier I thought from watching the Jeepinformant videos N5 would be the location to jumper from the + battery terminal while trying to jump a disable Jeep. Now it appears N5 is the same as + battery terminal that is also the same as N2 as long as the 60-amp fuse in the fuse bar is not blown (open).


I do not know WHAT DAMMAGE may occur to the disabled Jeep when jumping across the + battery terminal and N1 when the Power Control (ESS) relay is not requested to be engaged making the two batteries in parallel.

I'd simply follow what the owners manual says. Of course I haven't read that part yet, but I'm sure it is there.

 

[JIMBOX]

Well, I haven't tried it, but the OWNERS MANUAL says to hook jumper cable to POSITIVE TERMINAL and NEGATIVE jumper cable to NEGATIVE ground on ENGINE, NOT BATTERY--

Don't know the results--

Good luck

W.E.

JIMBO

 

[bam1111]

Well, I haven't tried it, but the OWNERS MANUAL says to hook jumper cable to POSITIVE TERMINAL and NEGATIVE jumper cable to NEGATIVE ground on ENGINE, NOT BATTERY--

Don't know the results--

Good luck

W.E.

JIMBO

That is the standard method of jumping most vehicles. They usually say to attach the negative to a ground away from the battery to prevent a spark near the battery.

 

[RussJeep1]

@JIMBOX and @bam1111 you guys may have just made really good points, even if inadvertently.

It is odd that the JL manual would suggest battery post to battery post "jump" tarting for the safety reasons you cite Jim. 'Jump' has quotes around it for reasons explained below.

And yet when I set up a trickle charger at home to keep some infrequently used motor vehicle's battery charged, say over the winter, the connection between it and the battery is directly to both battery posts.

The point of bringing up the trickle charger was to give respect to @twisty Bob's thoughts that we may be "chump starting," as opposed to jump starting our JLs.

Chump starting is Bob's (which I don't know if it's true for certain, but tend to believe) reference to the fact that maybe we really aren't jump starting our JL. As mentioned in prior posts, jump starting would be where the tow truck operator with his fully charged heavy duty battery hooks up his jumper cables to our JL and we are instantly thereafter good to crank the JL's engine successfully, provided are issue solely lies with lack of electrical power.

Chump starting on the other hand involves time. Time presumptively to charge the accessory/ESS battery sufficiently enough for the JLs computer to even be "willing" to attempt a crank, having seen adequate power on the Aux/ESS battery first.

The term is somewhat meant, I think, to suggest that FCA has written their manually in a way that leaves out key points not necessarily for simplicity but deception, in that they've referred to the process as "jump" starting when it may very well not be, discussed just one battery, advised battery post to battery post connection of the cables, and letting the charging source wait a few minutes without explaining much why.

You don't have to wait on a jump start if your charging rig's a tow truck that just drove 5 miles to come to your aid where its heavy duty battery (batteries) have been amply topped off by the alternator's access to them during the ride to your destination.

But you do on a chump start.

 

[JIMBOX]

Heh Heh, shoulda gotta stick !!!

W.E.

JIMBO

 

[twisty]

@JIMBOX and @bam1111 you guys may have just made really good points, even if inadvertently.

It is odd that the JL manual would suggest battery post to battery post "jump" tarting for the safety reasons you cite Jim. 'Jump' has quotes around it for reasons explained below.

And yet when I set up a trickle charger at home to keep some infrequently used motor vehicle's battery charged, say over the winter, the connection between it and the battery is directly to both battery posts.

The point of bringing up the trickle charger was to give respect to @twisty Bob's thoughts that we may be "chump starting," as opposed to jump starting our JLs.

Chump starting is Bob's (which I don't know if it's true for certain, but tend to believe) reference to the fact that maybe we really aren't jump starting our JL. As mentioned in prior posts, jump starting would be where the tow truck operator with his fully charged heavy duty battery hooks up his jumper cables to our JL and we are instantly thereafter good to crank the JL's engine successfully, provided are issue solely lies with lack of electrical power.

Chump starting on the other hand involves time. Time presumptively to charge the accessory/ESS battery sufficiently enough for the JLs computer to even be "willing" to attempt a crank, having seen adequate power on the Aux/ESS battery first.

The term is somewhat meant, I think, to suggest that FCA has written their manually in a way that leaves out key points not necessarily for simplicity but deception, in that they've referred to the process as "jump" starting when it may very well not be, discussed just one battery, advised battery post to battery post connection of the cables, and letting the charging source wait a few minutes without explaining much why.

You don't have to wait on a jump start if your charging rig's a tow truck that just drove 5 miles to come to your aid where its heavy duty battery (batteries) have been amply topped off by the alternator's access to them during the ride to your destination.

But you do on a chump start.

Could be that the time needed is what Luft was saying and I was mentioning prior, battery too low or maybe more likely now you are jumping two batteries that may be low. Not to mention all the electrical gizmo's that jeep needs on start up??

If we need to chump start in low voltage situation I'm not happy about it but we are starting, so it's not a huge deal. The biggy for me has always been two batteries with one being a PITA to get to.

 

[WranglerMan]

@twisty you are correct on the second battery, it’s bad enough that there are two but they honestly could have come up with a better place to put the dam thing instead of under the larger one

 

[twisty]

@twisty you are correct on the second battery, it’s bad enough that there are two but they honestly could have come up with a better place to put the dam thing instead of under the larger one

I should add the other big deal is if the small battery does take a poo (no one around to chump start) we all need a back up plan to use the bigger battery. It would have been nice if jeep used another relay or sorts to sense a low or no voltage condition and switch automatically to the bigger battery and pop a warning light. I would have respected that.

 

[mazeppa]

This thread of jumping a disabled 2018 JL with two batteries from the start made me curious when battery replacement was necessary if some frugal person did not want to purchase two batteries and try to operate a JL on one battery. Could the JL operate with N1 terminal jumpered to the main starter battery positive terminal permanently and leave the small auxiliary out of the circuit?

In the future when the 2018s JL need the batteries replaced, no problem with replacing the main starter battery, but the when small auxiliary need replaced it could be an expensive hard to find battery.

I do not mind the ASS that I have complete control over it, but the small auxiliary battery that is also kind of difficult to access drives me nuts. Not as nuts as a 48-volt battery underneath a JL with BSG would though.

 

[Rhinebeck01]

@mazeppa

I seriously doubt.. and I don't anticipate, that the ESS/Aux battery will be hard to find or expensive.

 

[JIMBOX]

Yeah, the only expensive part of it would be having a dealer replace it(outta warranty) and-

Knowing batteries and warranty's--it's gonna be interesting anywho !

W.E.

JIMBO

 

[mazeppa]

I am an old geezer that worries about things that do not deserve the time I spend worrying about them.

Also I am too cheap to buy two batteries, when I can purchase only one battery and use a piece bailing wire to jumper the terminals. I am sure this will work.

 

[JIMBOX]

Heh Heh, well--you aren't quite as old as I am, but I'm
afraid that the JL ECU control system is set up for a MAJOR/MINOR battery and PROGRAMMED as such, so

Trying to eliminate the MINOR battery will take some after MKT computer NERDS work for our benefit !

W.E.

JIMBO

 

[WranglerMan]

I am sure as time passes someone here with more smarts than me will come up with a way to bypass the smaller battery so it’s not needed, heck if someone came out with a kit now I would more than likely buy it, I seriously doubt if I knew ahead of time about the second battery if it would have influenced my decision to buy my JL but it would have made me think, I am curious as to how many other makers that incorporate ESS into their design if they use two batteries and if so how hard are they to get to.

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