2009 Grand Cherokee Changed Alternator no I have no power.

Asked by Michael Feb 19, 2020 at 05:57 PM about the 2009 Jeep Grand Cherokee Limited

Question type: Maintenance & Repair

I changed the Alternator on my 2009 Jeep Grand Cherokee 4.7L V8. Started
by disconnecting the positive terminal from battery. Second removed the
power cable from alternator as well as the clip wire from the back of alternator.
Three Bolts removed and it was out. Put new alternator in and reversed the
process, connected battery and I am completely dark. No power to anything.
Hooked up the vehicle with jumpers to my wife car and all interiors lights and
gauges are working but car won't turn over. I assume I have a bad alternator. I
remove and put old one in as it was still working just failing and I am still dark. I
searched for answers online and it seems it should be a fuse issue but which is
my "Main Fuse" as I'v seen it referred to online. Apparently it should be a 50 or
a 60. I only have three 50's and one is ASD, one is Heater, and if I remember
correctly the other is radiator fan. What is going on with my Jeep???

4 Answers
268,855

G A answered 10 months ago

Cause you disconnected main power without using a preset saver tool you have activated the security system and it went into full lock down. Check in the owners manual for the correct procedure to deactivate full shut down mode. Plus on some vehicles disconnecting main power will cause the BCM to loose its memory so then your accessories will either not operate or will operate but incorrectly, or some will and some won’t. If that’s has happened then it means a trip to the dealership to get the system reflashed. In my area it runs a hundred bucks.

Mark helpful
268,855

G A answered 10 months ago

Cause you disconnected main power without using a preset saver tool you have activated the security system and it went into full lock down. Check in the owners manual for the correct procedure to deactivate full shut down mode. Plus on some vehicles disconnecting main power will cause the BCM to loose its memory so then your accessories will either not operate or will operate but incorrectly, or some will and some won’t. If that’s has happened then it means a trip to the dealership to get the system reflashed. In my area it runs a hundred bucks.

Mark helpful
268,855

G A answered 10 months ago

Cause you disconnected main power without using a preset saver tool you have activated the security system and it went into full lock down. Check in the owners manual for the correct procedure to deactivate full shut down mode. Plus on some vehicles disconnecting main power will cause the BCM to loose its memory so then your accessories will either not operate or will operate but incorrectly, or some will and some won’t. If that’s has happened then it means a trip to the dealership to get the system reflashed. In my area it runs a hundred bucks.

Mark helpful
268,855

G A answered 10 months ago

I’ve had the same problem as you can see my last answer was delayed and it posted twice when it finally posted. This has been going on for over a month now. Had them look into it even with a problem question referenced but no answer.

Mark helpful

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