Question about 1999 Jeep Grand Cherokee

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1999 jeep gc 4.7 turn signals not working

I have a 99 jeep grand 4.7 turn signals will not work wen u first start driving but will work after 25 to 45 min of driving.they will work untill i is shut off for over a 2 hours. hazard do not work at the same time as the turn sigals do not work.

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Check your charging system and battery. Low voltage will give both the symptoms you listed. As you drive, some recharging will return system to near normal, till it sits again. I'd pay close attention to alternator output...You may have one bad diode. This added to a battery with low capacity will look the same as what you listed.
To make a "quick check" put a set of jumpers on it and connect to another battery. If directionals work properly then check everything I've said. A "alternator "quick check" is to put a voltmeter across the battery. Running with no accessories on you should see between 13.5-14.0 volts. With accessories on including lights on hi-beam, you should see no less than 12.9 volts and after a few minutes voltage should not fall off. Your battery should read no less than 12v after standing overnight (slightly less if near 0 temps)but definitely not less than 11.9. Also, make sure alternator drive belt is sufficiently tight and not slipping.

Posted on Jan 16, 2009

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Hello, I'm looking for a replacement for my jeep cherokee 99, the current part number is Chysler P56041 629AD, I found a Chysler P56041 278AD, can this computer works ok with my cherokee?


THE PCM MODULE.
no country stated, the 728ad shows Europe. (why?)
"I found"

where, at ebay, at pick-apart, or ?
USA cars have 11 PCM for one engine. fact.
and 100s more world wide.
what a question, just a p/n
then you post to grand Cherokee and then text leaving out Grand.?
why?
i searched the part at jeep and is wrangle part, 629ad.

you do know that it must be reprogrammed to your car right:?
the pcms on cars can vary
by engine, trans opted , 4wd/2wd,and year.
federal PCM
Calif PCM
and mexico PCM
and 9 more. just for 1999

is yours 42RE for 45RFE?? tranny??? 30/32 RH? what?
post county (or state if calif)
post engine and year
post body and not contradict.?
post drive line, in car, tranny and if 4wd?
then we can match it up
or call jeep.com

they (jeep) will do this magical thing!
ask you the VIN.
and then look it up in their database.
and see ALL THE ABOVE even what radio is in it. of 5.
me, im a glass half full guy (hard knocks, reality stuff)
id not even believe the part in car is correct.
im too SAVVY !
i find out from jeep what it should have first.

not one matches the 4.0L in the GC.


the 629 posted shows this at jeep.com

JEEP WRANGLER 2.5L Power Tech I-4 Cyl., 3-Spd. Automatic 30RH 1998
JEEP WRANGLER 2.5L Power Tech I-4 Cyl., 5-Speed Manual 1998
JEEP WRANGLER 4.0L I6 Power Tech, 3-Spd. Automatic 32RH 1998
JEEP WRANGLER 4.0L I6 Power Tech, 5-Speed Manual 1998
(if true needs to be programmed to each)

the send number
56041 278AD

lands at.
(part not found, is this a non usa part?) im stumped

was fun to try.
but im stumped.

Mar 31, 2016 | 1999 Jeep Grand Cherokee

1 Answer

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There is a connector on the transfer case for the range position. It is easily left loose or damaged during repairs. Look toward the top above where the shift arm attaches.

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1 Answer

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You need to be more specific. To start, which 4 wheel drive system your jeep has? (Select Trac, Quadra Trac II or Quadra Drive)
Then: does it never work, or only in 4-Lo?

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1 Answer

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Hello... Sounds like both Oxygen Sensors are bad or are not connected..

Good Luck....

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2 Answers

Turn signals hazards flasher don't work jeep cherokee replaced combination flasher relay, turn signal switch and still no signals


I NEED TO LOCATE THE SWITCH WHERE IS IT ?
MY INDICATORS NOR HAZARD LIGHTS ARE WORKING I DONT KNOW WHAT IS WRONG WITH IT CHANGED BULBS BUT NOTHIGN THEY ALL WENT OUT AT THE SAME TIME
SO THERE MUST BE A RELAY SWITCH SOMEWHER BUT DONT KNOW WHERE ?
THANKS FOR HELPING

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1 Answer

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Mar 11, 2009 | 1999 Jeep Grand Cherokee

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