Drained Battery, Any jumpstart tips??

[RussJeep1]

Thanks for your input. Watch this video from Brandon Halon of Youtube's Jeep Informant, This shows that all those terminals except N1 are connected to main battery through fused connections. Basically, N2 - N8 connect to the same power distributing piece of metal. And read the label on the underside of the PDC, it labels what terminals N1 - N8 connect to. Your jumper to N5 is electrically connected to the main battery on N2. It should go to N1 to connect to the Aux battery. Reread Rusty Teeth's posts #31 and #42, I believe he confirmed N1 - Aux and N2 - Main based on his voltage measurements at those points with depleted and charged batteries. Feel free to point out any flaws in this post.

Edited to add reference to #42

I hear you Jebiruph and will investigate this carefully. But let my pose my concern this way. In the Brandon Halon video I cited he claimed the wire off of T5 (N5 if you prefer) lead directly to the positive side of the ESS battery.

Was this wrong, or was it right and I am just missing a point you're making? (PSS: nevermind, I see above where you suspect that T5 doesn't go to the ESS battery.)

I'm going to reread Rusty Teeth's stuff like you said, and I fully believe you when you say I probably should be on N1, not N5.

I've seen this video. I probably just didn't take away from it the facts you did.

Thanks.

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[twisty]

So can you or can you not jump start a battery

Well I just saw this post and skimmed through it. I in fact did have my battery drain while sitting in my garage. Something was keeping the instrument cluster on along with the shift indicator lights. I didn't notice how long but my Jeep will sit for days sometimes and one day I went out to start it and it was dead. This happened to me twice. I first hooked up a charger to it with no luck but then I jumped it off of my truck. After about 5min I was able to start the Jeep. Like I said, this happened twice and after the second time something must have reset because the lights finally stopped coming on once the vehicle was shut off and haven't had any issues since but I was able to jump it the way you traditionally would.

OK so you can jump start it. Sounds like you just need to keep the jumper cables on for quite a bit before trying to start it.

Thank goodness, all this N this and N that had my head about ready to explode. lol

 

[1idrod]

First, it's sounds like you had a relay that was stuck closed, draining the battery. If it happens again, I would check the relays. Second, it's good to hear you were able to jump it the traditional way, but I wonder if that worked because the Aux battery still had a charge.

I don't know really if the Aux battery still had charge or not. All I know is as soon as I pushed the start button all interior lights would go off and nothing happened. I tried a charger overnight on 6amp with no luck but once I hooked up to my truck it only took about 5min. Once started I didn't shut if off until I drove 20 something miles and it started back up. Once home I noticed the same thing with the dash and shifter lights staying on but didn't drive again for a few days. Had to jump again but now lights have stayed off and I've had no other issues.

 

[Rusty Teeth]

When i drained my batteries, due to defective ess relay. That was replaced, but then i didnt have the full charge i expected on each battery. Also the dealer did not have the jeep long enough to do a proper
Full slow soak charge.
Placed 2 chargers fully computerised to prevent overcharging. They both took all night with 1amp Schumacher charger on each battery. N1 and N2
That lower voltage upon pickup of jeep was little low on on board batt indicator.
Thx

 

[twisty]

When i drained my batteries, due to defective ess relay. That was replaced, but then i didnt have the full charge i expected on each battery. Also the dealer did not have the jeep long enough to do a proper
Full slow soak charge.
Placed 2 chargers fully computerised to prevent overcharging. They both took all night with 1amp Schumacher charger on each battery. N1 and N2
That lower voltage upon pickup of jeep was little low on on board batt indicator.
Thx

What is the reading number that is considered low. Both of mine are 12.56 when everything is connected.
my understanding is that they are electrically connected until you hit the start button. I THINK that is what the relay is for???? dunno

 

[RussJeep1]

So can you or can you not jump start a battery


OK so you can jump start it. Sounds like you just need to keep the jumper cables on for quite a bit before trying to start it.

Thank goodness, all this N this and N that had my head about ready to explode. lol

Bob:

It's more than semantics for me to say that this thought of yours:

" Sounds like you just need to keep the jumper cables on for quite a bit before trying to start it."

isn't jump starting. Dare I say you might agree.

This is trickle charging the ESS battery, and then, for all intents and purposes you might as well remove the "jumper" err charging cables before tying to crank the JL. This takes time, jump starting is pretty much instant once the cables are connected.

I guess if you only have to do this for 60 seconds (I honestly don't know) then I am being picky without much foundation. But if this is, say, a 10 minutes operation, it has crossed the line for me from jumping starting to charging.

"Say buddy, my batteries are dead and (not my battery's dead--that would imply one battery) would you mind taking 10 minutes of your time to 'jump' start me?

Hay wait, come back here!!"

 

[twisty]

Bob:

It's more than semantics for me to say that this thought of yours:

" Sounds like you just need to keep the jumper cables on for quite a bit before trying to start it."

isn't jump starting. Dare I say you might agree.

This is trickle charging the ESS battery, and then, for all intents and purposes you might as well remove the "jumper" err charging cables before tying to crank the JL. This takes time, jump starting is pretty much instant once the cables are connected.

I guess if you only have to do this for 60 seconds (I honestly don't know) then I am being picky without much foundation. But if this is, say, a 10 minutes operation, it has crossed the line for me from jumping starting to charging.

"Say buddy, my batteries are dead and (not my battery's dead--that would imply one battery) would you mind taking 10 minutes of your time to 'jump' start me?

Hay wait, come back here!!"

LOL Your right BUT I think many (me) who are concerned with this are thinking about in the boonies where you have to get out and 5 or 10 minutes is small fry considering the alternative.

Although in the past I have witnessed batteries not start right away and had to be charged for a few minutes before it would turn the motor. My rule of thumb in any really low battery situation is replace it as soon as possible. Battery life is shortened when they get too low.

How about instead of jump start we call it chump start.

 

[Rusty Teeth]

I did it 4x in first 4 weeks of owning sahara. Yes its a charge not a jump.
Took the harley to wrk that day.
I think i was able to leave the shifter in D
And kill engine. But not really it went onto acc instead. Easy to do if you back into your drive way. Stop w brake, engine dies from ess you push button and walk away. So was i killing my own battery?

Seems it now goes ding ding ding and few dash and Drive light flashes after it got the latest update.

Is this readable or understandable.

 

[wolfdog]

The freakin' question is why the heck did Jeep do two batteries? Our Cherokee TH has one large battery,the ESS works much smoother and faster than our JLUS!

Another thread I'm sure?

Go Jeep!!!

 

[Jmonroe]

I'm with wolfdog. Who thought two batteries were a good idea? And once that bone head idea got past the engineers, who thought it would be a good idea to hide the second battery? If it has to be there it should be easily accessible.

 

[twisty]

I'm with wolfdog. Who thought two batteries were a good idea? And once that bone head idea got past the engineers, who thought it would be a good idea to hide the second battery? If it has to be there it should be easily accessible.

Waiting for someone to come up with a delete plan.

 

[RussJeep1]

Chump Start. Love it Bob!

It's not so much for me the two batteries, although the above thoughts on this have merit--as many JK owners with heavy power draw gear bought the second battery and the aftermarket double battery install kit, plus took the time to work on this mod,

It's that it seems more mission critical stuff like cranking the rig, at least from a cold start, got assigned to the tiny battery. Wouldn't it have made more sense to allow the larger battery, better able to crank the engine initially, to do it, so the rig could turn over, and the engine, via the alternator, could start charging the batteries?

I suspect FCA had reason for doing things this way. I wish I knew what it was.

I wish I had a crystal ball into the future regarding whether more aged JLs in more harsher winters would not be cranking because the small battery, with age and coldness, lacked the umph to effect the crank.

I hope this doesn't prove to be the case. And why would you isolate the batteries upon cold crank? Again, my ignorance here probably plays into the "whys" on this FCA design choice.

 

[JIMBOX]

I can forsee a relocation of the ESS battery to piggyback the main battery--

That wouldn't redesign/modify, or mess with the ECM programing and make things easier on US and keep them in the dark !

W.E.

JIMBO

 

[Hagie]

Only skimmed the thread, but with a dead battery, are you SOL on a manual trans or can you get it going with the pop and roll method?

 

[JIMBOX]

NOPE, popping the clutch/w the IGN in "RUN" works, at least mine has worked twice--

Now those two times were because of ENGINE STALLING--I just left the IGN sw in "RUN"--and while still rolling slow, put her in 2nd gear, popped the clutch and--BINGO-away I went-

That was one of the reasons i got the manual this time, just for the "POP THE CLUTCH" trick with a dead battery and I thought I was going to have to wire in a clutch/IGN switch, but-no need, once you arm the IGN system the engine can be started in gear/w the clutch-

Now ain't that just "SUPER"-

W.E.

JIMBO

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