Maybe you just took a couple years off the life of the brushes.

Hopefully you didn't arc out the rings they ride on. That can pit them
bad and it will then just chew up the brushes.

A charged battery and a restart will tell you fast. If it stays hot,
then it might be damaged.

The ring is round and the brushes come with a square end on them. The
square end on the brushes needs to wear a bit to give a nice connection
to the ring, it can arc all over the place drawing high amps to charge a
battery with a 1/32" contact vs the full width of the brush, close to
1/4".

11.8 V with no load is a really dead battery. Mine was just 12.2 and
wouldn't start it, it dropped to 10 with a load so I replaced it.

I put a new alternator in, but I was sure to charge the battery first.

Mike

JimG wrote:
>
> Hi Mike,
>
> I started it on the primary battery,,, it was about 11.8 V. The secondary
> was at 9v (I am not sure about it's quality now). Once it started I
> switched to both batteries. Do you think I damaged the new alternator? I
> only ran it for about 3 minutes till I noticed the overheating.
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FC5527B.71697ADF@sympatico.ca...
> > How did you start it up?
> >
> > The last alternator I bought and the 'big green' (maybe the name) one my
> > old tenant bought both say the warranty is void if you start them up on
> > a dead battery.
> >
> > A new alternator cannot take that amp surge until the brushes wear in a
> > bit, they just arc out all to crap. Arcing out means heat....
> >
> > That is why some shops refuse to put a new alternator in with an old or
> > dead battery. The battery needs a charge to break in an alternator.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > This week my batteries went dead. The alternator was not charging, only
> > > putting out about 12V. So I put a new alternator in this evening, and I
> > > have charge voltage, 13.8V, but the alternator is way overheating. Now
> the
> > > batteries are low, but I would think it should not overheat. I isolated
> the
> > > two batteries and it still gets too hot. What might cause this?
> > >
> > > --
> > > JimG
> > > 80' CJ-7 258 CID
> > > 35" BFG MT on 15x10 Centerlines
> > > D44 Rear, Dana 30 Front. SOA
> > > 4.56 Gears, LockRight F&R
> > > Dana 300 w/4:1 & Currie twin sticks
> > > Warn X8000i w/ dual batteries

 

Maybe you just took a couple years off the life of the brushes.

Hopefully you didn't arc out the rings they ride on. That can pit them
bad and it will then just chew up the brushes.

A charged battery and a restart will tell you fast. If it stays hot,
then it might be damaged.

The ring is round and the brushes come with a square end on them. The
square end on the brushes needs to wear a bit to give a nice connection
to the ring, it can arc all over the place drawing high amps to charge a
battery with a 1/32" contact vs the full width of the brush, close to
1/4".

11.8 V with no load is a really dead battery. Mine was just 12.2 and
wouldn't start it, it dropped to 10 with a load so I replaced it.

I put a new alternator in, but I was sure to charge the battery first.

Mike

JimG wrote:
>
> Hi Mike,
>
> I started it on the primary battery,,, it was about 11.8 V. The secondary
> was at 9v (I am not sure about it's quality now). Once it started I
> switched to both batteries. Do you think I damaged the new alternator? I
> only ran it for about 3 minutes till I noticed the overheating.
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FC5527B.71697ADF@sympatico.ca...
> > How did you start it up?
> >
> > The last alternator I bought and the 'big green' (maybe the name) one my
> > old tenant bought both say the warranty is void if you start them up on
> > a dead battery.
> >
> > A new alternator cannot take that amp surge until the brushes wear in a
> > bit, they just arc out all to crap. Arcing out means heat....
> >
> > That is why some shops refuse to put a new alternator in with an old or
> > dead battery. The battery needs a charge to break in an alternator.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > This week my batteries went dead. The alternator was not charging, only
> > > putting out about 12V. So I put a new alternator in this evening, and I
> > > have charge voltage, 13.8V, but the alternator is way overheating. Now
> the
> > > batteries are low, but I would think it should not overheat. I isolated
> the
> > > two batteries and it still gets too hot. What might cause this?
> > >
> > > --
> > > JimG
> > > 80' CJ-7 258 CID
> > > 35" BFG MT on 15x10 Centerlines
> > > D44 Rear, Dana 30 Front. SOA
> > > 4.56 Gears, LockRight F&R
> > > Dana 300 w/4:1 & Currie twin sticks
> > > Warn X8000i w/ dual batteries

 

Maybe you just took a couple years off the life of the brushes.

Hopefully you didn't arc out the rings they ride on. That can pit them
bad and it will then just chew up the brushes.

A charged battery and a restart will tell you fast. If it stays hot,
then it might be damaged.

The ring is round and the brushes come with a square end on them. The
square end on the brushes needs to wear a bit to give a nice connection
to the ring, it can arc all over the place drawing high amps to charge a
battery with a 1/32" contact vs the full width of the brush, close to
1/4".

11.8 V with no load is a really dead battery. Mine was just 12.2 and
wouldn't start it, it dropped to 10 with a load so I replaced it.

I put a new alternator in, but I was sure to charge the battery first.

Mike

JimG wrote:
>
> Hi Mike,
>
> I started it on the primary battery,,, it was about 11.8 V. The secondary
> was at 9v (I am not sure about it's quality now). Once it started I
> switched to both batteries. Do you think I damaged the new alternator? I
> only ran it for about 3 minutes till I noticed the overheating.
>
> JimG
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FC5527B.71697ADF@sympatico.ca...
> > How did you start it up?
> >
> > The last alternator I bought and the 'big green' (maybe the name) one my
> > old tenant bought both say the warranty is void if you start them up on
> > a dead battery.
> >
> > A new alternator cannot take that amp surge until the brushes wear in a
> > bit, they just arc out all to crap. Arcing out means heat....
> >
> > That is why some shops refuse to put a new alternator in with an old or
> > dead battery. The battery needs a charge to break in an alternator.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > JimG wrote:
> > >
> > > This week my batteries went dead. The alternator was not charging, only
> > > putting out about 12V. So I put a new alternator in this evening, and I
> > > have charge voltage, 13.8V, but the alternator is way overheating. Now
> the
> > > batteries are low, but I would think it should not overheat. I isolated
> the
> > > two batteries and it still gets too hot. What might cause this?
> > >
> > > --
> > > JimG
> > > 80' CJ-7 258 CID
> > > 35" BFG MT on 15x10 Centerlines
> > > D44 Rear, Dana 30 Front. SOA
> > > 4.56 Gears, LockRight F&R
> > > Dana 300 w/4:1 & Currie twin sticks
> > > Warn X8000i w/ dual batteries

 

In an effort to bring closure to a thread (as an earlier poster
suggested)... I ran the Jeep this morning after charging the batteries all
night, and all seems fine, the alternator runs cool. As you said Mike, I
may taken some of the life out of it though. Thanks for the help.

JimG

"JimG" <jimg@cj7_2muchspam.com> wrote in message
news:5Rbxb.1100$ss2.607@news01.roc.ny...
> This week my batteries went dead. The alternator was not charging, only
> putting out about 12V. So I put a new alternator in this evening, and I
> have charge voltage, 13.8V, but the alternator is way overheating. Now
the
> batteries are low, but I would think it should not overheat. I isolated
the
> two batteries and it still gets too hot. What might cause this?
>
> --
> JimG
> 80' CJ-7 258 CID
> 35" BFG MT on 15x10 Centerlines
> D44 Rear, Dana 30 Front. SOA
> 4.56 Gears, LockRight F&R
> Dana 300 w/4:1 & Currie twin sticks
> Warn X8000i w/ dual batteries
>
>

 

In an effort to bring closure to a thread (as an earlier poster
suggested)... I ran the Jeep this morning after charging the batteries all
night, and all seems fine, the alternator runs cool. As you said Mike, I
may taken some of the life out of it though. Thanks for the help.

JimG

"JimG" <jimg@cj7_2muchspam.com> wrote in message
news:5Rbxb.1100$ss2.607@news01.roc.ny...
> This week my batteries went dead. The alternator was not charging, only
> putting out about 12V. So I put a new alternator in this evening, and I
> have charge voltage, 13.8V, but the alternator is way overheating. Now
the
> batteries are low, but I would think it should not overheat. I isolated
the
> two batteries and it still gets too hot. What might cause this?
>
> --
> JimG
> 80' CJ-7 258 CID
> 35" BFG MT on 15x10 Centerlines
> D44 Rear, Dana 30 Front. SOA
> 4.56 Gears, LockRight F&R
> Dana 300 w/4:1 & Currie twin sticks
> Warn X8000i w/ dual batteries
>
>

 

In an effort to bring closure to a thread (as an earlier poster
suggested)... I ran the Jeep this morning after charging the batteries all
night, and all seems fine, the alternator runs cool. As you said Mike, I
may taken some of the life out of it though. Thanks for the help.

JimG

"JimG" <jimg@cj7_2muchspam.com> wrote in message
news:5Rbxb.1100$ss2.607@news01.roc.ny...
> This week my batteries went dead. The alternator was not charging, only
> putting out about 12V. So I put a new alternator in this evening, and I
> have charge voltage, 13.8V, but the alternator is way overheating. Now
the
> batteries are low, but I would think it should not overheat. I isolated
the
> two batteries and it still gets too hot. What might cause this?
>
> --
> JimG
> 80' CJ-7 258 CID
> 35" BFG MT on 15x10 Centerlines
> D44 Rear, Dana 30 Front. SOA
> 4.56 Gears, LockRight F&R
> Dana 300 w/4:1 & Currie twin sticks
> Warn X8000i w/ dual batteries
>
>