How to Fix Jeep Grand Cherokee Alternator Not Charging

5.9k Views 17 Likes 13 Comments
1

This will save you $800! Your voltage regulator is located inside of the PCM. Now I will show you how to install an external voltage regulator. Total cost $25.40

2
Image for Step 2

This is all you need!

Recommended For You
3
Image for Step 3

Disconnect the battery

4
Image for Step 4

Remove the battery.

5
Image for Step 5

Locate the blackbox connector on the back of the alternator.

6
Image for Step 6

Disconnect the black box connector.

7
Image for Step 7

Tape the connections so that it does not short out.

8
Image for Step 8

With the battery removed find a spot on the fender well to attach the voltage regulator.

9
Image for Step 9

Use the self tapping screws to attach the voltage regulator to the fender well.

10
Image for Step 10

Now take two barrel, and eyelets connectors and two lengths of wire long enough to go from the voltage regulator to the alternator. Attach a barrel and then Eyelet connector to the end of each one.

11

You will also need to add a length of wire to the barrel end of one of the wires. This wire will connect to a 12 volt source. You will need to find the positive field on the alternator.

12
Image for Step 12

The wire with the battery wire connected to it goes to the top terminal of the voltage regulator. This is very important if you choose the wrong terminal you will pop the voltage regulator.

13

Connect the eyelet ends of the wires to the alternator.

14
Image for Step 14

Now connect the wires to the voltage regulator and then reinstall your battery. Make sure you plug the wire with the battery voltage to the top terminal.

15

Once you have reinstalled your battery you can connect wire coming from the top terminal of the voltage regulator to the battery.

16
Image for Step 16

Connect your battery tester, start your vehicle to see if your alternator is charging your battery.

17
Image for Step 17

Okay now your alternator is charging! Pick up your tools put them away! You just saved $800!

keyboard shortcuts:     previous step     next step
Comments
13 COMMENTS
View More Comments