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Old 03-29-2015, 09:31 PM #1
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4.7 Alternator not charging help PLZ! Need ideas.

I'm experiencing something strange. Hoping someone can help ID the issue.

Currently:
Go wheeling for 6+ Hours today, (mud, water crossings etc) I experience no problems (watching very closely)
Towards the end of the day, battery light comes on. Alternator isn't charging.
Take to coin wash, spray off the alt/ engine, no help.
Drive home, hose wash, let it cool off etc, same issue exists.
I have an AGM battery (thankfully), after letting the truck sit, it shows 12.06v resting and 11.8 running (at the battery posts).
It's a Factory Denso ALT.

Previous:
Last time I went wheeling the same problem happened. I drove home, washed engine, pulled the ALT off, had it tested, it was fine. Put it back on everything is good since then. (month-ish)

So what have I done differently besides taking it off and re-installing it? That's a lot of work btw so i'd rather not do it "just because."

This is my daily so not having a ride tomorrow really sucks. Any suggestion is welcome.
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Old 03-29-2015, 10:58 PM #2
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Id say alternator is bad. If you have a big dog battery and a short commute to work, you could probably just charge the battery overnight and drive to work and home tomorrow. Leave all the accessories you can afford to off.
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Old 03-29-2015, 11:03 PM #3
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Running voltage should be 13.8 ish at 1500 rpm.
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Old 03-30-2015, 09:23 AM #4
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Thanks for responding ya'll. I wasn't sure how many responses, if any I would wake up to this morning.

I talked to a buddy who is a Ultra Certified Master Toyota Tech (seriously though, he's been wrenching for Toyota longer than i've been driving)

He agreed that "typically" Toyota Alternators don't go bad. It's just not normal.

Obviously the change in circumstances that I introduced is water. Muddy water.
I was laying in bed thinking about what I did last time that might have fixed it and his thoughts went in the same direction.

In order to pull the alternator out, you have to unplug the little 3 wire plug from the side or back. One of those wires tells the alternator to turn on. More than likely, water has worked its way into that plug and has created a short which makes it think it's not supposed to be running.

My plan this afternoon is to pull my skid and try to get that wire off without pulling the entire alternator. It could be tough but thats the plan. I'll use compressed air to dry the plug and the alternator, probably pack the plug with dielectric grease and maybe try to seal up the entire pigtail from the plug back.

This is all obviously on a hunch. But It's a plan, and sometimes it just helps to have a plan.
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Old 03-30-2015, 10:41 AM #5
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I just recently had charging issues also. For me it ended up being a 15A IGN1 fuse in the fuse box in the cabin. Took me a new alternator and battery to figure that out.
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Old 03-30-2015, 01:49 PM #6
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For future reference, the alternator fits through the wheel well
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Old 03-30-2015, 01:53 PM #7
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Quote:
Originally Posted by hondarcb View Post
I just recently had charging issues also. For me it ended up being a 15A IGN1 fuse in the fuse box in the cabin. Took me a new alternator and battery to figure that out.
I saw your thread/ post and checked that last night. My fuse is intact, for better or for worse. Good info though.
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Old 03-30-2015, 01:57 PM #8
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how many miles on the alternator? my fj alternator went out at 130k miles
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Old 03-30-2015, 04:37 PM #9
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Quote:
Originally Posted by 470SNC View Post
how many miles on the alternator? my fj alternator went out at 130k miles
122k
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Old 03-30-2015, 07:31 PM #10
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anyone remember the thread about putting in the 200A Supra Alternator?
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Old 03-30-2015, 08:05 PM #11
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im approaching 125k so ill be watching my alt.
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Old 03-30-2015, 09:05 PM #12
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Well, none of my attempts to make it work have succeeded. So i'm researching replacements.

SWEET BABY JESUS new factory alternators are $600!!!!

Its so crazy... there are Reman units from O'rileys for less than $200 and OEM for $600. I don't get it .
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Old 03-31-2015, 08:24 AM #13
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Got my alternator out last night. @bergs maybe it fits through the fender on a V6 but short of removing the power steering bracket, I don't see it coming out on a V8. I pulled my skid plate (which had half a inch of mud standing in it) and dropped it out the bottom.

I'm taking it in to get tested this morning, although even if it works I don't think i'm going to put it back in. My Toyota Tech buddy gave me the schematic for the 3 wire plug on the back and all the wires measure as they should.

I have a line on a used OEM alternator locally so i'll try to get that today and see if it remedies my problem.
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Old 03-31-2015, 09:09 AM #14
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Well, good news... I guess?

My alternator is bad! Puts out 11~ish volts.

At least I have a defintive "its not working" condition, vs the a month ago where "its broken... oh wait, it works." heh...
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Old 03-31-2015, 09:40 AM #15
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Snuck it through just fine on my V8 and yes, steering pump is moved

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Last edited by bergs; 03-31-2015 at 09:42 AM.
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