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Re: Charging problem 90 XJ
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CarGuru > Jeep Willys > Re: Charging problem 90 XJ 23 April 2005 08:08:56
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Re: Charging problem 90 XJ

Mike Romain 15 April 2005 16:43:12
 I have seen several loose their ground between the alternator bracket
and the engine block so you might want to try a booster cable from the
battery negative to the alternator case to see if it fires up.

If not, try from the batter negative to the firewall, lots of times that
wire mesh ground strap from the head to the firewall rots or breaks.

And that place where all the wires are is called the starter relay. The
bolt post on it is just a convenient connection to bring a mess of wires
together.

Also those fuse links can just up and die with no visible evidence.
They get hard and crystal, then a flex can snap them. You should check
them with a meter on continuity. See if there is a connection from the
relay post to the alternator post.

Then if all else fails, I would hit the alternator with a hammer. If it
fires up, the brushes are worn out and it is time for a kit or a
replacement. I prefer kits.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's



JRK58@MSN.COM wrote:>
I should add that I charged the battery overnight prior to installing> the new alt. I have checked and cleaned both ends of both battery> cables. The fusible link shows no sign of over heating, and it charged> fine for 3 weeks prior to this problem.
Add comment
Snow 15 April 2005 17:20:49 [ permanent link ]
 did you replace the alt. with a new or used one? If its a used one the
regulator could be shot (it's internal to the alt.).
Check those wire connections like Mike suggested also double check the
connections on the alt. even do a continuity check on them, I have seen a
broken wire on the small stud (thinks its the field wire??) cause a similar
problem on my XJ.
Have you had the battery tested? a week alt. can cause a battery to
discharge to a state where it will no longer hold a charge.

Snow...

<JRK58@MSN.COM> wrote in message
news:1113528989.972­741.163690@o13g2000c­wo.googlegroups.com.­..> My XJ died due to a no charge condition, battery tested good, alt> tested bad. Replaced alt, ammeter showed no charge so I checked the> fuse links and connections at the.....well I'm not sure what it's> called but it has a stud that all the fuse links bolt to and 4 spade> type connectors, I didn't really do anything to it other than plug and> unplug and clean the connections.After that it started charging showing> 14 amps. Well it's not charging again, I went thru the same motions to> no avail. Any ideas?>


Add comment
Jeff Strickland 15 April 2005 22:46:02 [ permanent link ]
 You should check the "new" alternator again. My guess is you took off a bad
one and put another bad one in its place.



<JRK58@MSN.COM> wrote in message
news:1113528989.972­741.163690@o13g2000c­wo.googlegroups.com.­..> My XJ died due to a no charge condition, battery tested good, alt> tested bad. Replaced alt, ammeter showed no charge so I checked the> fuse links and connections at the.....well I'm not sure what it's> called but it has a stud that all the fuse links bolt to and 4 spade> type connectors, I didn't really do anything to it other than plug and> unplug and clean the connections.After that it started charging showing> 14 amps. Well it's not charging again, I went thru the same motions to> no avail. Any ideas?>


Add comment
L . W . Hughes III 15 April 2005 23:58:35 [ permanent link ]
 So is the battery dead again? If the battery is fully charged the
Amp meter will read zero. If you're reading the stock gauge than that is
in volts and should always read fourteen while the engine is running, no
mater what your charging system is actually doing. If your volt meter
just reads the battery's voltage, twelve, than you have an open between
the battery and the alternator, the fuse link or it connections. Run a
jumper will test that. Still no charge? Than that's what we have
warranties for. And don't reverse the polarity next time.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd@­aol.com http://www.billhugh­es.com/

JRK58@MSN.COM wrote:>
My XJ died due to a no charge condition, battery tested good, alt> tested bad. Replaced alt, ammeter showed no charge so I checked the> fuse links and connections at the.....well I'm not sure what it's> called but it has a stud that all the fuse links bolt to and 4 spade> type connectors, I didn't really do anything to it other than plug and> unplug and clean the connections.After that it started charging showing> 14 amps. Well it's not charging again, I went thru the same motions to> no avail. Any ideas?
Add comment
L . W . Hughes III 21 April 2005 06:36:31 [ permanent link ]
 You have verified your alternator battery's terminal is connected
to the battery and the stator is being tickle. You need another new
alternator.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd@­aol.com http://www.billhugh­es.com/

JRK58@MSN.COM wrote:>
Well I purchased a volt meter today and here is what I found.>
Batt. Post to post 12.61> Batt to relay stud 12.58> Alt post to case 12.36 running> Alt post to case 12.56 off> Yellow alt wire key on 12.23 key off 0.0> Tan/Black alt wire 0.0 key on 0.0 running>
I have traced the Tan/blk wire 2 plugs back and get 0 volts. What> should this wire be reading? If it should be hot like I think it does> where does it go? Any help will be greatly appreciated. Thanks
Add comment
L . W . Hughes III 21 April 2005 06:54:15 [ permanent link ]
 Take it back because it's not good now.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd@­aol.com http://www.billhugh­es.com/

JRK58@MSN.COM wrote:>
So the blk/tan wire should not have voltage? I pulled the alt and it> tested good, I tried to exchange it for another but they said since it> passed they wouldn't do it. Thanks for the reply Bill
Add comment
Robb S via CarKB.com 21 April 2005 07:15:53 [ permanent link ]
 Bill,
I bow to you as a jeep knowledge god. MIKE, seems to be a close second.
all advice sounds good but everyone forgot to mention where he really went
wront. He went to SCHUCKS for the alternator. Not anyone's fault, he
didn't mention it till the end. Most people go through seven or eight
before they get a good one..... Experience!!!!
Anyway, when having electrical problems like bad grounds, etc...or cleaning
terminals, ALWAYS apply some dielectric grease to keep the gremlins away
for a longer time.
thanks all!
Robb

--
Message posted via http://www.carkb.co­m
Add comment
L . W . Hughes III 21 April 2005 10:10:02 [ permanent link ]
 You look over their shoulder while they're spinning it, at the volt
and amp gauges, and maybe explain to them it should be reading fourteen
volts.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd@­aol.com http://www.billhugh­es.com/

JRK58@MSN.COM wrote:>
It's actually an autolite alternator if that makes any difference. What> should I tell the guy at Shuck's if he hooks it up to the tester and it> passes again?
Add comment
Mike Romain 21 April 2005 16:58:09 [ permanent link ]
 For starters you have bad/dirty battery connections according to those
readings. A no load volt drop of .03V is significant, then the neg drop
of .04V, well.....

All the readings like the alternator post to case (12.56) and battery
post to battery post (12.61) must be equal with no load.

Did you ever try my ground jump suggestions? You 'sure' have the
symptoms of a dead connection.

Without the proper ground path, the alternator will not turn on.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JRK58@MSN.COM wrote:>
JRK58@MSN.COM wrote:> > The battery had a full charge when the volt meter (thought it was an> > amp gauge) dropped from 14 to 12 or less. Actually it was charging> when> > I parked it and not charging the next time I started it. Thanks>
Well I purchased a volt meter today and here is what I found.>
Batt. Post to post 12.61> Batt to relay stud 12.58> Alt post to case 12.36 running> Alt post to case 12.56 off> Yellow alt wire key on 12.23 key off 0.0> Tan/Black alt wire 0.0 key on 0.0 running>
I have traced the Tan/blk wire 2 plugs back and get 0 volts. What> should this wire be reading? If it should be hot like I think it does> where does it go? Any help will be greatly appreciated. Thanks
Add comment
Mike Romain 21 April 2005 17:47:23 [ permanent link ]
 You 'cannot' have tight clean battery cables with the volt drops you are
reporting, something is not letting the power pass cleanly. This drop
'will' affect your charging to some degree if it isn't the cause of all
the trouble.

Have you tried the meter on continuity to see if it will beep from the
battery positive to the alternator positive? There is a fuse link
between them that blows.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JRK58@MSN.COM wrote:>
Yes I jumped from alt case to battery neg., block to battery,firewall> to block and to battery. Battery cables have tight clean connections> but are old. Thanks........John
Add comment
Mike Romain 21 April 2005 21:13:23 [ permanent link ]
 Try the voltage difference from the alternator positive wire/bolt to the
battery negative for a reading to compare with battery post to post
reading.

This will tell you how much drop is in the positive line connections
better. I then walk the meter back while holding the meter on battery
negative. I go from alternator post, to the alternator wire eye loop,
then to the copper in the wire, then to the relay eye loop, then the
relay bolt, then the battery positive cable clamp, then the post itself.

Are you in the rust belt? I find some cables just up and crystallize,
especially that mesh strap from the rear of the engine head to the
firewall.

One other place to check for a bad ground is on the passenger side of
the engine at the back. There is a bolt there with a mess of small
wires hooking to it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JRK58@MSN.COM wrote:>
I figured since there was only a difference of .05v between the relay> post and the alt post continuity was ok. I am going to install new> battery cables tonight. Thanks
Add comment
Mike Romain 21 April 2005 23:29:50 [ permanent link ]
 Not always, the small ones on the bolt on the block are the computer
harness grounds and the route to the body could be compromised at the
same time.

Mike

JRK58@MSN.COM wrote:>
I'm in Washington State, lots of rain but no salt on the roads.Wouldn't> the jumper from battery neg to alternator case rule a ground problem> out?.....Thanks, John
Add comment
L . W . Hughes III 23 April 2005 08:08:56 [ permanent link ]
 Thanks.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd@­aol.com http://www.billhugh­es.com/

JRK58@MSN.COM wrote:>
Well, turns out it was the two wire plug to the alternator wasn't> making a good contact. Sometimes its the simplest things that get by> Me. I'd like to thanks all you Folks for the help, I'm sure everything> I've learned will come in handy someday.
Add comment
 

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CarGuru > Jeep Willys > Re: Charging problem 90 XJ 23 April 2005 08:08:56
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