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Old 07-06-2015, 06:37 AM
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battery drain making starting difficult?

Hi everybody! So, lately my jeep grand cherokee laredo zj is a little slow to start- sometimes doesn't seem like it's going to happen. I notice the battery level is lower than normal. The weird thing is, when I give it a little gas while turning the ignition, it starts right up. Can these things be connected? What do y'all think? Thanks in advance!

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  #2  
Old 07-06-2015, 07:27 AM
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Re: battery drain making starting difficult?

I would start by letting the battery tested. A battery looses its capacity over time and will let the engine crank slower. Also the battery voltage can colapse to around 9 V or lower during the start and can influence sensor outputs and make it inject less fuel then required to start.
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Old 07-06-2015, 07:28 AM
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Re: battery drain making starting difficult?

Not sure about your specific problem but I too worry a little about the constant drain on our AGM battery. Part of the time, I keep an AGM specific battery charger connected to the battery connections in the engine compartment. It's trickle charging right now.

Dan
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Old 07-06-2015, 08:17 AM
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Re: battery drain making starting difficult?

When mine was new last year the AC clutch switch was stuck, causing a constant drain that resulted in a dead battery. It took a few days for the dealer to figure it out.
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Old 07-06-2015, 10:13 AM
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Re: battery drain making starting difficult?

AGM batteries are great and at least ours in the JGC's are fairly accessible! Use an AGM approved battery charger (like CTEK) if you want the extra protection, and from my previous experience on various other vehicles, I keep my vehicle locked whilst in the garage and I believe that helps shut down some of the battery sucking programs and keep drain at a minimum.
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Old 07-06-2015, 02:19 PM
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Re: battery drain making starting difficult?

Mine sometimes sits for a week or two at a time & never had a problem starting. Parasitic drains should be less than 20ma. Could something else (e.g. brake controller) be pulling it down ? Try walking around at night & look for any lights.
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Old 07-06-2015, 02:31 PM
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Re: battery drain making starting difficult?

No, I didn't mean to imply my battery was getting too low. I just want it fully or near to being fully charged all the time. I have been traveling at least 30 miles every other day or so.

I too leave the doors locked because of my Glock in it.

I believe I've found an excellent charger; the Optimate6. It's small with a variety of info on its cover. It's expensive though.

Dan
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Old 07-06-2015, 03:41 PM
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Re: battery drain making starting difficult?

Quote:
Originally Posted by Lightninrod View Post
Not sure about your specific problem but I too worry a little about the constant drain on our AGM battery. Part of the time, I keep an AGM specific battery charger connected to the battery connections in the engine compartment. It's trickle charging right now.

Dan
The OP has a ZJ, where a good old fashioned non-AGM Die Hard is overkill...

I'd suggest springing for a cheap volt meter.

Before touching the starter, measure across the two posts.
Then, measure from the + post to the body right near the alternator. Any drop is good indication of connector crud.
Post both numbers.

Then, see if you can bribe someone to measure across the posts while starting to see how much you drop at the two posts. Reasonable indication of aging battery.

A bit trickier is to measure from the + post to the big terminal on the starter itself while starter is running. Some very small drop is normal, but is a good indication of poor connections.

Cleaning of connectors, including the ground to the body would be a starting point if not already done. Battery model and age also would help with advice.
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Old 07-06-2015, 03:43 PM
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Re: battery drain making starting difficult?

Am slowly converting to AGMs on almost everything and have been using little 80ma HF Float chargers for years for those not DDs. Think one of my Optimas is approaching its first decade with NP.
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