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tightened loose alternator belt, now have "discharge warning light"?

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Old 02-01-2009, 11:07 AM   #1
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tightened loose alternator belt, now have "discharge warning light"?

howdy ya'll...this is my first post and I'm glad to be a new member. The dealer I bought the truck from put an undersized batt. in it along with a block of 2x4 to keep it snug(yeah...you heard me right!) Sure enough on the way home the block came loose and wedged itself in my cooling fan! The dash lights blew out and I headed back to the dealer and dropped it off to have the fan replaced. Afterwards my dash lights wouldn't work and kept blowing fuses. The other day my alternator belt started squealing...loose belt, simple enough. However, after I tightened her up, I got a "discharge warning light" on the dash and my fuel pump started quitting on me especially going uphill or stepping on the gas(truck idles fine, bucks + hesitates when driving). I'm taking the alt. and Batt. to get tested momemtarily. I've replaced fuel filter, cleaned plugs, removed and tested the wiring harness and all grounds and connections. I'm guessing it's the voltage regulator in the alt. but if anyone has had this experience in the past and feels like chiming in it would be greatly appreciated! -Thanks, Lewis

p.s: the dealer went under so Im on my own!
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Old 02-01-2009, 11:15 AM   #2
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Holy crap... Wonder why he dealer went under?

Welcome, I'm sure someone on here knows exactly what is wrong. I'm not too familiar with the first gens.
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Old 02-01-2009, 11:19 AM   #3
With sufficient thrust, pigs fly just fine.
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Im stumped. Dash lights AND fuel pump cutting out? The voltage reg. IS on the alternator, cant hurt to check it out.
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Old 02-01-2009, 11:22 AM   #4
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by tacoma jake View Post
they prolly put too many 2x4s in the engine bays :d
lmao!!!
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Old 02-01-2009, 11:22 AM   #5
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Quote:
Originally Posted by chris4x4 View Post
Im stumped. Dash lights AND fuel pump cutting out? The voltage reg. IS on the alternator, cant hurt to check it out.

Its probably the voltage regulator gone bad, making all kinds of trouble
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Old 02-01-2009, 11:24 AM   #7
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by TRD4x4858 View Post
Its probably the voltage regulator gone bad, making all kinds of trouble
Thast my guess too, but its strange the dash lights AND fuel pump to be screwing up isnt indicative of a bad voltage reg. Thats what puzzles me. Almost sounds like a connection is loose somewhere.
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Old 02-01-2009, 11:26 AM   #8
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by phantom View Post
just a hunch
is your alternator working at all?
and with loose belt is it free turning and not froze up?

suspect when the battery went into the fan it might have shorted out and blew the alternator ( the diodes are in it , no longer s separate unit

think you can go to the auto parts store and they can check out the alternator?
that is what i would do first !
OK! Phanotom, you sparked my brain to fire up........If the bearings are bad in the alt. it will give a bad output also.
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Old 02-01-2009, 12:12 PM   #9
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Quote:
Originally Posted by chris4x4 View Post
Thast my guess too, but its strange the dash lights AND fuel pump to be screwing up isnt indicative of a bad voltage reg. Thats what puzzles me. Almost sounds like a connection is loose somewhere.

A sudden drop in alternator output could cause a fuel pump "cutout" because its actual voltage dropping and vehicle about to stall, voltage dropping could shoot all warning lights on, low voltage signals
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Old 02-01-2009, 01:50 PM   #10
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by TRD4x4858 View Post
A sudden drop in alternator output could cause a fuel pump "cutout" because its actual voltage dropping and vehicle about to stall, voltage dropping could shoot all warning lights on, low voltage signals
But its not going to go lower than the curant battery out put. So the cutting of the fuel pump is odd......Until I thought What Phantom just posted

Quote:
Originally Posted by phantom View Post
ok, while he is looking i would spend extra time looking at the battery cables, could have a flaky ground or not good connection on the new battery ;-D
that would explain the weardness. but nothing about the alternator that is why i say go there first ;-D


one last thing, he has been driving it on discharging so no telling the status of the battery ! so with no alt and a non charged battery all kinds of things can happen

in the old days i had a dead alt and try9ing to nurse it to a store and every time i flipped a turn signal the engine would cut out in sink with the signal
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Old 02-02-2009, 06:38 AM   #11
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Beyond 'universal' battery and alternator possibilities, it's hard to troubleshoot these symptoms without knowing the model year of the Tacoma.
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Old 02-02-2009, 06:41 AM   #12
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by EnolaGaia View Post
Beyond 'universal' battery and alternator possibilities, it's hard to troubleshoot these symptoms without knowing the model year of the Tacoma.
1995 Tacoma Its in his "Info".
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Old 02-02-2009, 08:54 AM   #13
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Thanks for the enthusiastic response!

This forum blows the others out of the water! Advance Auto parts put the alt. on the machine and got 11V and a faulty diode light...hmmm? At home I took her apart and ohmed out the rectifier...checking both the positive and negative rectifier diodes to ensure "one-way" continuity. They all failed. upon closer inspection it lookes like they're burnt up...no big deal, found replacement for $30.
What's the best way to test the voltage regulator as I'm betting it got smoked too? My Haynes manual says to "ground terminal 'F' with engine running then check batt voltage ..if higher-replace regulator, if lower-check alternator. Do I need to replace the the rectifier before I can do this test acurately? ...or should I assume the voltage reg. is bad too and order em' both right now? -Thanks, Lewis
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Old 02-02-2009, 08:57 AM   #14
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Quote:
Originally Posted by Tacoma Jake View Post
They prolly put too many 2x4s in the engine bays
hehehe..waka waka waka!
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Old 02-02-2009, 11:15 AM   #15
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Quote:
Originally Posted by chris4x4 View Post
Im stumped. Dash lights AND fuel pump cutting out? The voltage reg. IS on the alternator, cant hurt to check it out

thats what im thinkin' too...any idea how one would go about testing the voltage reg.?
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Old 02-02-2009, 04:37 PM   #16
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by VermonTacoma View Post
thats what im thinkin' too...any idea how one would go about testing the voltage reg.?
I have always just connected a multi meter (set to 20 DC volts) to the battery. At Idle, it should read the current batt. voltage, then I would rev it up, and monitor the voltage. Around 1200 rpm, it should be 13.8 volts, and it should stay pretty close to that all the way up. If the voltage keeps climbing, the regulator is bad.
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