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  #1  
Old June 13th, 2019, 12:06
XJ16FW's Avatar
XJ16FW XJ16FW is offline
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Voltage regulator

Where is the voltage regulator on a 1989 XJ? I just replaced the alternator because the battery wasn't charging, but it is still not charging. I am hoping it might be the voltage regulator.
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Old June 13th, 2019, 19:09
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8Mud 8Mud is offline
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Re: Voltage regulator

The voltage regulator is built into the Alternator.
The most likely issue is no power on the yellow wire hooked to the I/F stud on the alternator, with the ignition on.
Possible the fusible link on the red batt wire is burnt out.
How are checking the charging voltage? You can't really trust the dash gauge.
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Old June 13th, 2019, 20:02
lawsoncl lawsoncl is offline
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Re: Voltage regulator

Inside the alternator. Check that the connector on the back of the alternator has voltage when the engine is running. Would suck if you replaced the alternator because of a wiring issue or blown fuse.
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Old June 14th, 2019, 02:35
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Re: Voltage regulator

Quote:
Originally Posted by lawsoncl View Post
Inside the alternator. Check that the connector on the back of the alternator has voltage when the engine is running. Would suck if you replaced the alternator because of a wiring issue or blown fuse.
Yes it would :-(
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Old June 14th, 2019, 02:38
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XJ16FW XJ16FW is offline
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Re: Voltage regulator

Quote:
Originally Posted by 8Mud View Post
The voltage regulator is built into the Alternator.
The most likely issue is no power on the yellow wire hooked to the I/F stud on the alternator, with the ignition on.
Possible the fusible link on the red batt wire is burnt out.
How are checking the charging voltage? You can't really trust the dash gauge.
I used a digital voltmeter at the battery terminals. I will check the wiring and fusible link.
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Old June 14th, 2019, 05:00
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8Mud 8Mud is offline
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Re: Voltage regulator

You may want to check out Cruisers ground refreshing list. I did an ohm test on one of my alternator replacements when it charged poorly and found a significant resistance in the ground circuit. Not enough for no charge, but enough for a poor charge.
It's also possible something is wrong with your battery.
Be careful tightening the yellow (I/F) and tan (L) wire studs on the alternator, it's possible to spin the stud and break the connection internally. I clean the studs and wire rings then just snug them, then cover them with a finger full of grease or dielectric paste.
Sometimes the connection studs are marked differently, the important one is almost always I, F or I/F.
Not beyond the realm of possibilty, you got a new alternator that is faulty or a return/rebox that the parts guy gave you.
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