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Old 11-11-2005, 05:01   #1 (permalink)
kojmorbid
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Battery Draining 88 T-bird V8 - Help/Advice

I have a 1988 Ford Thunderbird V8 - 2 days ago my batt was drained -
wouldn't hold charge bought new one - No issues until tonight when I tried
starting and batt was drained - Jumpped it and ran for 5 minutes, shutdown,
restarted fine so batt is charging, ran it for another 5 min and shutdown,
disconnecting batt till I can t/s tomorrow. Okay questions - I noticed the
day before my batt died the blinkers wouldn't come on all the time which
prior never had an issue with - Take note I packed my trunk up full so
stuff was pressing against the wires - Could there be a short somewhere in
the trunk to cause this??? The Alt, is it possible it is weak and will
discharge my batt over a period of time??? I plan to read out wires, check
my fuses - Any other pointers before I take the step of replacing my ALT.
Can the Alt be bad and still charge batt when driving??? Is it bad to
disconnect the batt each time I turn off the vehicle, in case I can find
the source over the weekend - Any help would be appreciated, can't afford
to take it to a shop and I'd rather do it myself, if I can just go through
the hassle of disconnecting the batt each time I shutdown w/o complications
I'll do so till I can fix it - Inputs Plz
Thanks,
Tony

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Old 11-11-2005, 05:01   #2 (permalink)
Backyard Mechanic
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Re: Battery Draining 88 T-bird V8 - Help/Advice

"kojmorbid" <kojmorbid@yahoo.com> wrote:

> I have a 1988 Ford Thunderbird V8 - 2 days ago my batt was drained -
> wouldn't hold charge bought new one - No issues until tonight when I
> tried starting and batt was drained - Jumpped it and ran for 5
> minutes, shutdown, restarted fine so batt is charging, ran it for
> another 5 min and shutdown, disconnecting batt till I can t/s
> tomorrow. Okay questions - I noticed the day before my batt died the
> blinkers wouldn't come on all the time which prior never had an issue
> with - Take note I packed my trunk up full so stuff was pressing
> against the wires - Could there be a short somewhere in the trunk to
> cause this??? The Alt, is it possible it is weak and will discharge my
> batt over a period of time??? I plan to read out wires, check my fuses
> - Any other pointers before I take the step of replacing my ALT. Can
> the Alt be bad and still charge batt when driving???


Yes

> Is it bad to
> disconnect the batt each time I turn off the vehicle, in case I can
> find the source over the weekend - Any help would be appreciated,


You can do that... the only effect is that the ECM loses all it's learned
about running the engine at its most efficient.

> can't afford to take it to a shop and I'd rather do it myself, if I
> can just go through the hassle of disconnecting the batt each time I
> shutdown w/o complications I'll do so till I can fix it - Inputs Plz


Have the alt tested... you dont say whether the car has a voltmeter on
the dash, I thought they did.
The drain problem MAY be somewhere else.

So maybe you should go to radio shack and buy a cheap vom while you're at
it.

--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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Old 11-11-2005, 06:01   #3 (permalink)
kojmorbid
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Re: Battery Draining 88 T-bird V8 - Help/Advice

I will have access to a fluke multimeter over the weekend, hopefully I can
find the problem. I'll get the alternator tested in the AM - So your
saying it can drain my batt even if it seems to be working and charging
the Batt??? - Hopefully it can be as simple as an alternator however I
suspect something may be shorted in my trunk, since I was moving stuff and
packing it, turn signals working intermittingly - I'll look there too

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Old 11-11-2005, 06:01   #4 (permalink)
Backyard Mechanic
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Re: Battery Draining 88 T-bird V8 - Help/Advice

"kojmorbid" <kojmorbid@yahoo.com> wrote:

> I will have access to a fluke multimeter over the weekend, hopefully I
> can find the problem. I'll get the alternator tested in the AM - So
> your saying it can drain my batt even if it seems to be working and
> charging the Batt??? - Hopefully it can be as simple as an alternator
> however I suspect something may be shorted in my trunk, since I was
> moving stuff and packing it, turn signals working intermittingly -
> I'll look there too
>
>


or like, a 'power inverter"?

--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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Old 11-11-2005, 06:01   #5 (permalink)
MasterBlaster
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Re: Battery Draining 88 T-bird V8 - Help/Advice


"kojmorbid" wrote

> prior never had an issue with - Take note I packed my trunk up full so
> stuff was pressing against the wires - Could there be a short somewhere in
> the trunk to cause this???


Might have dislodged the trunk light, so it's on all the time?

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Old 11-11-2005, 06:01   #6 (permalink)
kojmorbid
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Re: Battery Draining 88 T-bird V8 - Help/Advice

Well I will get back to you guys later on today and update you on what I've
did,found,fixed etc - Then we can go from there - Thanks so far for the
inputs
-Tony

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Old 11-11-2005, 10:01   #7 (permalink)
Scott
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Re: Battery Draining 88 T-bird V8 - Help/Advice


"kojmorbid" <kojmorbid@yahoo.com> wrote in message
news:2d1e56ec9308a47ad3d4403814f92f48@localhost.talkaboutautos.com...
>I will have access to a fluke multimeter over the weekend, hopefully I can
> find the problem. I'll get the alternator tested in the AM - So your
> saying it can drain my batt even if it seems to be working and charging
> the Batt??? - Hopefully it can be as simple as an alternator however I
> suspect something may be shorted in my trunk, since I was moving stuff and
> packing it, turn signals working intermittingly - I'll look there too
>


Yes your alternator may charge the battery. Then when it sits overnight
a bad diode in the alternator will allow the battery to discharge.


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Old 11-11-2005, 12:01   #8 (permalink)
kojmorbid
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Re: Battery Draining 88 T-bird V8 - Help/Advice UPDATE

Ok guys this is where I am at and I am leading to bad alt - Thsi what I get
from what I've read out

Engine Off- 11.97 Vdc
Engine Idle - 12.03 Vdc
Engine @ 2200 RPM - 12.37

Engine Idle w/ Lts On - 11.74 Vdc
Engine @ 2200 RPM w/ Lts on - 11.88 Vdc

Neg Batt Term Wire - .1 Ohms
Pos Batt Term Wile - .6 Ohms

Okay the Three wires going into the Alt on upper left side. Wires are old
so I can confirm the wire color but here is the resistance of each
Top Wire to Grd - 298 Ohms
Mid Wire to Grd - .4 Ohms
Bot Wire To Grd - .4 Ohms

Okay now who can help here, What I can see and please correct me if I am
wrong is that my alernator is weak to charge - Isn't the Batt suppose to
read around 13.5 to 14 Vdc while running esp. at 2200 RPM. I am guess
since one of the phases into the alternator is High resistance it has lost
a phase and isn't effectivly charging my Batt and maybe even draining my
Batt because of it. Anyways does my troubleshooting sound correct, anyone
know the resistance values of each phase in the alternator - Before I
begin ripping out my alternator please give me your thoughts on it.
Thanks for the help everyone,
Tony

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Old 11-11-2005, 12:01   #9 (permalink)
The One
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Re: Battery Draining 88 T-bird V8 - Help/Advice UPDATE


"kojmorbid" <kojmorbid@yahoo.com> wrote in message
news:4dc84d7743633be2becc6f63d1416ffb@localhost.talkaboutautos.com...
> Ok guys this is where I am at and I am leading to bad alt - Thsi what I

get
> from what I've read out
>
> Engine Off- 11.97 Vdc
> Engine Idle - 12.03 Vdc
> Engine @ 2200 RPM - 12.37
>
> Engine Idle w/ Lts On - 11.74 Vdc
> Engine @ 2200 RPM w/ Lts on - 11.88 Vdc
>
> Neg Batt Term Wire - .1 Ohms
> Pos Batt Term Wile - .6 Ohms
>
> Okay the Three wires going into the Alt on upper left side. Wires are old
> so I can confirm the wire color but here is the resistance of each
> Top Wire to Grd - 298 Ohms
> Mid Wire to Grd - .4 Ohms
> Bot Wire To Grd - .4 Ohms
>
> Okay now who can help here, What I can see and please correct me if I am
> wrong is that my alernator is weak to charge - Isn't the Batt suppose to
> read around 13.5 to 14 Vdc while running esp. at 2200 RPM. I am guess
> since one of the phases into the alternator is High resistance it has lost
> a phase and isn't effectivly charging my Batt and <SNIP>



Just get a new alternator and stop ****ing about.


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Old 11-11-2005, 12:01   #10 (permalink)
Sharon K.Cooke
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Re: Battery Draining 88 T-bird V8 - Help/Advice UPDATE

kojmorbid wrote:
>
> Ok guys this is where I am at and I am leading to bad alt - Thsi what I get
> from what I've read out
>
> Engine Off- 11.97 Vdc
> Engine Idle - 12.03 Vdc
> Engine @ 2200 RPM - 12.37
>
> Engine Idle w/ Lts On - 11.74 Vdc
> Engine @ 2200 RPM w/ Lts on - 11.88 Vdc
>
> Neg Batt Term Wire - .1 Ohms
> Pos Batt Term Wile - .6 Ohms
>
> Okay the Three wires going into the Alt on upper left side. Wires are old
> so I can confirm the wire color but here is the resistance of each
> Top Wire to Grd - 298 Ohms
> Mid Wire to Grd - .4 Ohms
> Bot Wire To Grd - .4 Ohms
>
> Okay now who can help here, What I can see and please correct me if I am
> wrong is that my alernator is weak to charge - Isn't the Batt suppose to
> read around 13.5 to 14 Vdc while running esp. at 2200 RPM. I am guess
> since one of the phases into the alternator is High resistance it has lost
> a phase and isn't effectivly charging my Batt and maybe even draining my
> Batt because of it. Anyways does my troubleshooting sound correct, anyone
> know the resistance values of each phase in the alternator - Before I
> begin ripping out my alternator please give me your thoughts on it.
> Thanks for the help everyone,
> Tony


It's most likely the alternator (diode). An alternator has three different
windings, and it sounds as if you've lost one. A healthy alternator will output
13.5 to 15.0 volts (15V BRIEFLY), depending on RPM, temperature, and state of
battery charge. A fully charged battery with no draw on it = 12.66 volts, and
the charging device has to input at least 1/2 volt MORE than that to overcome
internal resistances in wiring and the battery itself. In other words, 13.1
volts isn't charging the battery, but 13.3 volts is charging (VERY slowly).










)
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