zckattkisbck

I have a 89 I have put 3 differnt alternator in it from 3 diff places all of. Them have not charges the battery I have replaced the battery and the ground wire to the block and repplaced the wire coming crime the alternator this is my every day driver I have to ride to work with 2 batterys because 1 dies have way to work please help me out on this one I've been wraping. My head around this for days n hit a dead end I have no idea what else could be why the alternator is not putting out a charge ....

goblinish15

my guess is your voltage regulator is bad this happened to me!!!!!

tjwalker

Voltage regulator is absolutely suspect here. Without that working properly, you won't charge.

Do NOT install any more alternators!

JeepingDan

Voltage regulator is built into the alternator.
I've run into this problem myself and it turned out to be the plug that bolts into the firewall into the back of the fuse box had a bad connection.
Unbolt it from under the hood and clean out the pins and reinstall.

Other thing.. The wires on the back of the fuse block sometimes lose contact.
Try wiggling them with the engine running. When you hit the right one you should here the Alternator kick on.

freegdr

isnt the regulator in the ecm ?

JeepingDan

No. it's built into the alternator on a 89 XJ.
One thing that can be done as a last resort because it's not getting feed back to tell it to charge is to just rewire the harness to the ignition for key on position.

freegdr

where can i get info on that ,which years are which years are not in the ecm

freegdr

i found it never mind

JeepingDan

From what I know 88 and up are all built into the alternator.
The regulator is rarely separate from the alternator on most vehicles these days unless you come across aftermarket charging systems.

freegdr

http://jeephorizons.com/phpbb/viewtopic.php?p=63878

zckattkisbck

So more then likely im looking at wiring problems still ... ugh well im about to go mess with it now n see what I find I know the alternator is not not bad because every once in a blue moon all my lights get real bright n ill pull over n check voltage n it will b 14 ish but I turn it off go to work n when the day is over ill start old betsy up n check voltage 11.98v wtf must be wiring ...

tjwalker

Renix voltage regulators are built into the alternator, but 91 and newer the voltage regulator is part of the computer.

To the OP. I'd consider doing a wholesale ground freshening, not just the one. Here is more on that.
----------------------------------------------------


Grounds can be the root cause of many electrical gremlins. Refreshing grounds is NEVER a bad idea!

You can't just check or look at these grounds. You must remove, scrape, clean until shiny the cable/wire ends and whatever they bolt to. The one on the back corner of the head, and where it attaches to the firewall. Scrape the paint from the firewall. Best to replace that woven cable with a #4 or #2 gauge cable. You can attach the one end to the intake manifold if you would like.

Next go over to the engine dipstick tube stud. Remove the nut and clean the wire ends and scrape the block until shiny at the stud. Reattach tightly.

If you are so inclined, add at least a #6 cable from the negative terminal of your battery to one of the bolts on your radiator support. Scrape the paint off first.