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  #1  
Old 01-11-2016, 06:29 AM
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Wont strt after heavy rain

Second time when we have had heavy rain when I start The Wolf up my battery is dead , bought new battery so its not that .Could this be the distributer cap ?

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  #2  
Old 01-11-2016, 06:46 AM
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Re: Wont strt after heavy rain

Is the battery really dead, or will it just not start? Did you measure the battery voltage with a digital volt meter? A full batery shows 12.7 V (half an hour after charging).
If you switch the headlights on, do they work normally? Donīt know if you changed the engine in your jeep for something else, but the 4.0L and 4.7L donīt have a distributor cap.
That you asked about the distributor cap, does it mean that it will crank, but not start? Describing the problem with as much as possible details, will add a lot in the way we can help you.
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  #3  
Old 01-11-2016, 11:22 AM
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Re: Wont strt after heavy rain

It rained overnight checked jeep at 21.00 hrs and alarm light was flashing - all normal 07;30 turned ignition on nothing all dead ,got machanic to check and battery charging was at correct point for alternator reading,after several minutes everything worked again clocked showed 00-16 as time battery failed.
Noticed that interior lights didnt go off when I closed the doors today but didnt notice anything last time I locked up,turned lights off by steering wheel stalk,also the heated seat light was on although the heated seats dont work,could any f these two issues have drained the battery which is just a few months old,ive had this problem before when its been heavy rain over the weekend and I dont use the jeep Sundays and Mondays ive a flat battery.something seems to drain her ive tried her 4 times since I got her started today and ive had no problem shes starting fine .
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Old 01-11-2016, 04:53 PM
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Re: Wont strt after heavy rain

Quote:
Originally Posted by knight1485 View Post
It rained overnight checked jeep at 21.00 hrs and alarm light was flashing - all normal 07;30 turned ignition on nothing all dead ,got machanic to check and battery charging was at correct point for alternator reading,after several minutes everything worked again clocked showed 00-16 as time battery failed.
Noticed that interior lights didnt go off when I closed the doors today but didnt notice anything last time I locked up,turned lights off by steering wheel stalk,also the heated seat light was on although the heated seats dont work,could any f these two issues have drained the battery which is just a few months old,ive had this problem before when its been heavy rain over the weekend and I dont use the jeep Sundays and Mondays ive a flat battery.something seems to drain her ive tried her 4 times since I got her started today and ive had no problem shes starting fine .
Definitely battery going low. Probably something that drains it more heavily when wet, but it would seem that you'd also be getting drain when dry unless someone has placed a conductor-impregnated object from your battery to ground or similar.

Pick up a cheap digital voltmeter, as it can really help needing to take it to a mechanic as this rolls out.


I'd suggest checking the key/lights off drain under normal conditions to make sure it falls on the low side of normal.

If that's all good, then you may have to figure out how to get it wet, which probably involves really high humidity in addition to possible water leaks hitting something bad.

If all else fails, disconnect the battery when about to rain.
Then, you'll want an ammeter in series with the battery and the load.
Get an automotive one, as it may have to handle a lot of current when you connect the load.

Check the drain and if it is excessive, start pulling fuses to see what drops it.
Work on the ones going to the body unless you have reason to suspect heavy corrosion under hood.

Good luck.
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Old 01-11-2016, 06:41 PM
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Re: Wont strt after heavy rain

That the interior lights stay on all the time for sure can drain your battery. How about the power windows/locks, do they work ok?
The interior lights (and heated seat switch lights) are switched by the BCM (body control module), with inputs from door ajar switches. Several wires used for the ajar switches run through connector C200, which sits in the passengers footwell area. This connector is known to give problems to the PCI data bus due to water ingress and/or corrosion which causes short between the pins. Water normally enters here due to leakage from the windshield seal. I would have a look at this connector, just to be sure.
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  #6  
Old 01-12-2016, 01:15 PM
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Smile Re: Wont strt after heavy rain

Many thanks for your replies, ive a mechanic who I use and he is checking the jeep Friday and then again Saturday with [ I think ] an amp meter which will give a good idea if something is draining the battery.I used the jeep today and she started straight away , you wouldnt think anything had gone wrong the day before,and again started perfect tonight when I returned from work.I will give both replies to the mechanic and will let you know how I get on at the weekend.Many thanks to both of you.: :
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Old 01-12-2016, 02:07 PM
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Re: Wont strt after heavy rain

I wonder ..... I hit a large puddle passenger side [ right hand drive jeep] and with the reply I had regarding passenger footwell connector if that is my problem maybe its not the rain getting in but me going through puddles at a moderate speed and the water splashing up to that area .Just a thought .
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Old 01-12-2016, 09:02 PM
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Re: Wont strt after heavy rain

The connector is inside the jeep, so normally splashing water from the road should not do a thing.
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Old 01-13-2016, 01:08 PM
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Re: Wont strt after heavy rain

Many thanks for that reply do you know of anything that could affect the jeep from underneath, ive a raised suspension ,I do recall a while back I went through a large puddle and all my dash board lights dimmed for a second or two ?
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Old 01-13-2016, 03:05 PM
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Re: Wont strt after heavy rain

Did you check underneath the passengers side carpet if it is wet overthere? The problem seems to be related to water, if it comes in via the windshield seal or some other spot via the wheel well, that is the question. Was connector C200 checked?
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  #11  
Old 01-14-2016, 02:03 PM
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Re: Wont strt after heavy rain

The mechanic is not coming until Friday many thanks for your help and will let you know the outcome
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Old 01-16-2016, 02:11 PM
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Re: Wont strt after heavy rain

The mechanic said the problem is that the interior door lights are somehow draining the battery [ he did an amp test ] the only issue is that after removing the fuses one by one the lights remained on, is there another fuse box in these jeeps [ ive got the one under the drivers side ] or do you turn these lights off somewhere else ? . Checked the c200 and it was all ok and dry .
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