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Dead Alternator Question
09-13-2015, 07:16 AM
Post: #1
Dead Alternator Question
Apparently the water was deeper than I thought in one spot. Besides needing a new air filter and oil change, the alternator is dead.

Dumped some water on it trying to clean it out. It will work for a few seconds up to a minutes, but then goes out. It seemed to start working, partially, after I dumped some water onto it to clean it out a bit.

Anyone know if it may be salvageable or cleanable? It definitely needs to have the crap cleaned out before anything else.

Mike
2000 XJ Cherokee - 3.5'' lift / 32'' Tirerecapper Pizza Cutters / Front Locker
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09-15-2015, 06:39 PM
Post: #2
RE: Dead Alternator Question
Any luck? Its strange that adding water to an electrical component would make it work better.

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09-16-2015, 02:56 PM
Post: #3
RE: Dead Alternator Question
I haven't done anything yet. Although the Jeep is going to need a GOOD cleaning under the engine bay. It's completely covered in mud in there. Well, now dirt.

I think the muddy water just clogged up the internals; the brushes aren't able to do their thing. It may even work now after sitting and drying out. When they dropped it off from the tow truck, it did work for a few minutes ... then went back out.

Tonight or tomorrow night, I'm going to try flushing it with distilled water and then spray it with contact cleaner (want to avoid the WD40 as it can eat the carbon brushes).

We'll see what happens. If nothing happens, off to pick and pull to pull a junkyard one then I will swap and change it out.

The good news for the engine is, there's no water in the oil so doesn't look like I sucked enough water in to damage anything. Still going to pick up a new air filter.

Once I get it running I am going to change out the diff fluids and transfer case fluid - both have bad seals. Then pull all the ECU connections and clean those.

Is it recommended to put dilectric grease in the ECU connections? I hear a lot of mixed thoughts on that.

Mike
2000 XJ Cherokee - 3.5'' lift / 32'' Tirerecapper Pizza Cutters / Front Locker
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09-16-2015, 08:15 PM
Post: #4
RE: Dead Alternator Question
Would water or Brake cleaner work better..
(09-16-2015 02:56 PM)Miller88 Wrote:  I haven't done anything yet. Although the Jeep is going to need a GOOD cleaning under the engine bay. It's completely covered in mud in there. Well, now dirt.

I think the muddy water just clogged up the internals; the brushes aren't able to do their thing. It may even work now after sitting and drying out. When they dropped it off from the tow truck, it did work for a few minutes ... then went back out.

Tonight or tomorrow night, I'm going to try flushing it with distilled water and then spray it with contact cleaner (want to avoid the WD40 as it can eat the carbon brushes).

We'll see what happens. If nothing happens, off to pick and pull to pull a junkyard one then I will swap and change it out.

The good news for the engine is, there's no water in the oil so doesn't look like I sucked enough water in to damage anything. Still going to pick up a new air filter.

Once I get it running I am going to change out the diff fluids and transfer case fluid - both have bad seals. Then pull all the ECU connections and clean those.

Is it recommended to put dilectric grease in the ECU connections? I hear a lot of mixed thoughts on that.
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09-16-2015, 09:39 PM
Post: #5
RE: Dead Alternator Question
Brake cleaner could eat some of the petroleum based connection, wire insulation, epoxy around the windings. Anything with oil will degrade the brushes.

Cleaned it out. Very large clumps of mud fell out. Then followed with electronics cleaner.


Nothing.

Tapped it with a hammer to free the brushes up and we are back in business! !

Mike
2000 XJ Cherokee - 3.5'' lift / 32'' Tirerecapper Pizza Cutters / Front Locker
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09-17-2015, 05:15 PM
Post: #6
RE: Dead Alternator Question
I'd tear it apart & clean it all out & re-lube as you put it back together

good luck

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09-21-2015, 09:55 AM
Post: #7
RE: Dead Alternator Question
Well, appears the Alternator works so well aftter being cleaned that it burnt out the 12V receptacles.

... which are reated for 20A and have a 15A fuse in them.

And this is why I say that Daimler-Chrysler era Jeeps are the worst. "Lets rate the recepticles for 20amps and have them burn out with a load less than 20 amps!!"

Mike
2000 XJ Cherokee - 3.5'' lift / 32'' Tirerecapper Pizza Cutters / Front Locker
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09-27-2015, 01:56 PM
Post: #8
RE: Dead Alternator Question
Made it exactly 500 miles. I think all the crap inside wore the brushes out.

So got a new one in.

Mike
2000 XJ Cherokee - 3.5'' lift / 32'' Tirerecapper Pizza Cutters / Front Locker
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11-05-2015, 08:24 AM
Post: #9
RE: Dead Alternator Question
Still having some issues from this whole ordeal! I think some mud water got in the battery. Was driving the other night and the voltage pegged. Shut it off and that was it.

Played around trying to jump it with the car (I have a really crappy set of cables) and it ran but the alternator was struggling to keep voltage.

Threw in a used batter from 2011 ... it was free ... and we're back in business for now.

Mike
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