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the switch under the battery tray is a ambient temp sensor and it charges the battery accordingly to make sure it does not over charge or under charge if it goes bad your battery wont charge. Thats some info for you what it sounds like is a bad starter solenoid. if you re post i can help you more im a college student for a automotive high performance school and a big jeep person i got two
Park your Jeep Grand Cherokee on
a level surface, activate the emergency brake and place blocks behind
the back tires for safety. Disconnect the negative battery cable with a
terminal puller and isolate it. Raise the front end of the car with a jack for easier access to the starter.
Check for a support bracket if
your Jeep Grand Cherokee has four wheel drive (also in some
transmissions). You will find the support bracket between the front axle
and side of the transmission. Remove the two support bracket bolts at
the transmission and pry the support bracket away slightly to obtain
access to the starter bolts. Place the bolts you remove in the jar for
safe keeping until later.
Support the weight of the
starter and unfasten the starter mounting bolts. Place the bolts in the
jar. Move the starter toward the front of the vehicle. The nose of the starter pinion housing should clear the housing.
Point the nose of the starter
downward and lower the starter enough to remove the nut that fastens the
battery positive cable wire harness connector eyelet to the solenoid
battery terminal stud.
Remove and disconnect the
positive battery cable from the solenoid terminal stud/connector
receptacle. Remove the starter motor from the engine of your Jeep Grand
Take your malfunctioning starter
to the parts store with you. Aftermarket distributors re-manufacture
most of the starters they sell, so you can likely obtain a partial
credit toward your new starter by exchanging your old one. Be sure that
you take care not to damage the starter in transit, because the better
condition it is in, the more you can get for it.
Purchase a replacement starter
that has the same or higher cranking capacity (power rating) as the
original starter. Also, match the bolt patterns, drive gears and
electrical connections. Your owner's manual may list specifications or
the auto parts technician will help you determine them. Download an
owner's manual on the My Jeep website.
Installation of the New Starter
Snap the solenoid wire to the starter motor. Remember to support the weight of the starter at all times.
Reconnect the positive battery cable to the solenoid stud and tighten the battery cable eyelet nut.
Position the starter next to the
transmission. If your Jeep Grand Cherokee has an automatic
transmission, put the cooler tube bracket in position. Install and
tighten the starter mounting bolts. Replace transmission support
Lower your Jeep Grand Cherokee
back to the ground. Reconnect the negative battery cable. Turn the key
in the ignition to see if your new starter motor functions correctly.
On an intermittent start problem like this you may be having a starter solenoid issue or your wire on the starter from the key switch may be loose. Or you may have a corroded battery cable or the safety neutral switch may be going bad. Is it a automatic? If it were it would be the clutch safety switch going out. So do the simple things first. Clean cables like the first guy said if that does not fix it locate the starter and if you have jumper cables the next time it does it put the positive lead of the jumper cable on the Positive battery terminal and the other touch to the starter wire with the key in the run position where the big wire on the starter is, if you here it spin it means the starter motor is ok if it don't it is bad or the connection on the starter is loose. Also a bad battery cable could cause this from the battery to the starter next put a small wire into the end of the positive jumper cable and touch the S terminal on the starter if you here a solid clung it means the solenoid is good. So check the connections on the starter and tighten the starter bolts as they may have worked loose and don't have a good ground. So if you want more as stance just post on my question and I will hell p more and if this is more informative please rate
Turn you healights on. Turn the car on. If the headlights burn bright, the battery is good. If the engine does not turn over, the problem is probably the starter bendix. The starter bendix is a part of the starter. Have your starter checked at starter repair shop or where you buy your car parts. (You have to unhook the battery terminal from the negative battery post before taking off the starter.)
If the lights did not burn bright, and the engine doesn't turn over. You could have a bad connection. On the Volvo, it has a positive wire and 3 wires that attach to the positive battey post. I clean the battery post with a battery post brush. I clean the terminal ends of the other 3 wires that attach to the positive battery terminal. I use a wire brush to clean the 3 wire terminals. I spray the wire terminals with a electrical motor cleaner (or electrical cleaner) that I pick up at the automotive parts store. Don't spray it on the paint of the car. I put wires on one side of the positive battery terminal. I put a nut on the battery bolt. I tighten another bolt to it. I tighten it tight. I put the positve battery terminal on the positive battery post and tighten (don't tighten this to tight). The positve terminal should be tight enough not to move (but don't tighten it to tight.)
If you clean the positive battery post and negative battery post, you should have bright front headlights when the car is turned on. If not, you have a battery or alternator problem or both.
test battery voltage , should be 12 volts, also check battery amp draw when you attempt to start engine, you should have 12 volts at the starter solenoid , you could have a faulty starter motor, battery cables and or terminals... even with a good battery check for vltage drop from battery positive post to battery positve at solenoid ... large drop equals bad cable, replace ... just points to check....
Try replacing the wire from the positive battery cable to the small terminal it is attched to. It is the smaller gauge wire that is attched to the battery terminal. Be sure to use the right gauge, don't over or undersize it. I had this problem and it did'nt stop until I changed this. Without this wire in good condition, the starter will crank too slow or not crank at all, mimicking other problems (like bad battery, bad starter , etc.). Post if it works.