Having problems with your 2003 Jeep Grand Cherokee ?

1997 Jeep grand Cheeroke

\015 I have some type of problem where the battery is getting drained while my jeep is not running. It has a new battery also and it needs a jump to be started once started if one terminal is disconnected it will still run but connected if I shut it off all I get is click click I have no idea what the prob. could be????\015 Posted / edited by AnonymousUser on : 23-10-2017

Answers :

My Answer:
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\015\012Being an expert in this Electronics field this should be fairly easy.
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\015\012It appears your charging system is functioning OK as you did the\015\012QUICKIE alternator/regulator test and that part appears to be fine.
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\015\012Next - Never ASSUME you have a good, or NEW battery. I've seen brand\015\012new batts fail a few months after purchase for no known reason at all.\015\012Water level should be topped off esp during Hotter weather as water\015\012level will drop as the batt ages.
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\015\012AND - when in doubt - Always do a hydrometer test on each cell, and\015\012make sure all cells read equally at approx 1.285 to 1.290 - indicating\015\012a fully charged batt.
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\015\012When doing a LOAD TEST with an external 100 Amp Load Tester make sure\015\012you disconnect the POS terminal cable (or better yet both batt cables)\015\012on the batt before doing a good Load Test on a fully charged batt.
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\015\012Batt voltage on a good fully charged batt should never drop much below\015\01211.4 to 11.7 volts doing a 10 second load test using a Load Tester\015\012similar to say one bought at Harbor Freight Tools for like $15 when\015\012they are on sale.
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\015\012If the top of the batt is wet (for whatever reason such as dew-point or\015\012leaky batt acid) this will cause the batt to self-discharge right\015\012across the top of the batt. Just like putting a small light-bulb across\015\012the batt posts and causing a drain. It happens more times than you care\015\012to know. When I worked at SEARS I seen it day in and day out......trust\015\012me I know!
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\015\012Next - you'll want to check for a couple things at night, or else\015\012daylight will work as well - if you have good eyesight. You want to\015\012check and make sure your "backup lights" aren't ON when the Headlights\015\012Switch is turned OFF and the Ignition Switch is OFF as well. Sometimes\015\012a SHORTED Transmission Backup Light Switch will cause a battery drain\015\012with everything shut off. Sometimes!
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\015\012Also - If you have any Interior Lights left on when the SUV doors are all closed that will surely drain the battery down.
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\015\012A radio/stereo left ON will do the same as well.
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\015\012A shorted tail-light (or any marker light) will also cause a battery to drain over time.
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\015\012Jeeps that have a under the hood light Mercury Tilt Switch for the\015\012Engine compartment sometimes can have this switch mounting come loose\015\012and when you shut the hood the light will actually stay lit thus\015\012draining the batt down as well. Make sure you check it at NIGHT during\015\012darkness as it will show up better.
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\015\012If all this proves NOT to be the cause then you will have to do an\015\012actual DVM inline amp meter test to see just how much current leakage\015\012(shorting) you have. A fuse block isolation test will next have to be\015\012done to isolate from which circuit leg the short (or current drain) is\015\012coming from.
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\015\012Once that circuit is isolated then it's just a matter of finding the shorted device or shorted wire(s).
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\015\012If you just added anything new electrical wise to the Jeep recently-\015\012then that is a good starting point - for if the problem wasn't there\015\012before that time, and now it is - then there is your culprit!
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\015\012If you are using an external battery charging PV (Photo-voltaic) panel,\015\012and it's bad for any reason - then it will drain your battery down as\015\012well, esp if the blocking or back diode goes bad.
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\015\012Also - If you have a dual battery system with a BATTERY ISOLATOR\015\012installed you might want to double check all your wiring there as well\015\012- as I've seen them go bad and cause many a battery problem!
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\015\012It's gotta be something I just went over here - as I covered everything......
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\015\012Let me know what it was OK?
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\015\012Thx,
\015\012
\015\012Frank
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Repair Help & Product Troubleshooting for 2003 Jeep Grand Cherokee

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