Jeff, thanks for the info, and I will work on the ground situation.

But, as I said in my original post, I have put a new bulb in the left brake
light, so I doubt it is a bad one.


--James--

 

Jeff, thanks for the info, and I will work on the ground situation.

But, as I said in my original post, I have put a new bulb in the left brake
light, so I doubt it is a bad one.


--James--

 

Jeff, thanks for the info, and I will work on the ground situation.

But, as I said in my original post, I have put a new bulb in the left brake
light, so I doubt it is a bad one.


--James--

 

The brake light and signal ground through the fizture bolts, the running
lights ground through the wiring harness.

You have changed all the rears out, but you still have tow up front
connected to the brake circuit, the front signals.

Do the signals work? They use the same bulb element as the brake
lights.

If not, then I would next look at the front bulb for a loose glass part
or filament short....

If it is ok, then I would be looking at any trailer hitch plugs.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James wrote:
>
> Brake lights work fine, when neither the parking lights or headlights are
> on.
>
> When either the parking lights or headlights are turned on, the left
> brakelight goes off !!!
>
> I have put brand new bulbs in left/right/upper-center brakelight housings.
>
> Again, the brake lights operate ok, as long as I don't have the headlights
> or the parking lights on. The minute I turn either of them on, the LEFT
> brake light will not work !!! This is truly weird.
>
> Can anyone help me ???
>
> Thanks !!
>
> --James--

 

The brake light and signal ground through the fizture bolts, the running
lights ground through the wiring harness.

You have changed all the rears out, but you still have tow up front
connected to the brake circuit, the front signals.

Do the signals work? They use the same bulb element as the brake
lights.

If not, then I would next look at the front bulb for a loose glass part
or filament short....

If it is ok, then I would be looking at any trailer hitch plugs.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James wrote:
>
> Brake lights work fine, when neither the parking lights or headlights are
> on.
>
> When either the parking lights or headlights are turned on, the left
> brakelight goes off !!!
>
> I have put brand new bulbs in left/right/upper-center brakelight housings.
>
> Again, the brake lights operate ok, as long as I don't have the headlights
> or the parking lights on. The minute I turn either of them on, the LEFT
> brake light will not work !!! This is truly weird.
>
> Can anyone help me ???
>
> Thanks !!
>
> --James--

 

The brake light and signal ground through the fizture bolts, the running
lights ground through the wiring harness.

You have changed all the rears out, but you still have tow up front
connected to the brake circuit, the front signals.

Do the signals work? They use the same bulb element as the brake
lights.

If not, then I would next look at the front bulb for a loose glass part
or filament short....

If it is ok, then I would be looking at any trailer hitch plugs.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James wrote:
>
> Brake lights work fine, when neither the parking lights or headlights are
> on.
>
> When either the parking lights or headlights are turned on, the left
> brakelight goes off !!!
>
> I have put brand new bulbs in left/right/upper-center brakelight housings.
>
> Again, the brake lights operate ok, as long as I don't have the headlights
> or the parking lights on. The minute I turn either of them on, the LEFT
> brake light will not work !!! This is truly weird.
>
> Can anyone help me ???
>
> Thanks !!
>
> --James--

 

The brake light and signal ground through the fizture bolts, the running
lights ground through the wiring harness.

You have changed all the rears out, but you still have tow up front
connected to the brake circuit, the front signals.

Do the signals work? They use the same bulb element as the brake
lights.

If not, then I would next look at the front bulb for a loose glass part
or filament short....

If it is ok, then I would be looking at any trailer hitch plugs.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James wrote:
>
> Brake lights work fine, when neither the parking lights or headlights are
> on.
>
> When either the parking lights or headlights are turned on, the left
> brakelight goes off !!!
>
> I have put brand new bulbs in left/right/upper-center brakelight housings.
>
> Again, the brake lights operate ok, as long as I don't have the headlights
> or the parking lights on. The minute I turn either of them on, the LEFT
> brake light will not work !!! This is truly weird.
>
> Can anyone help me ???
>
> Thanks !!
>
> --James--

 

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:q_GdnVZ8neaGKPbfRVn-iQ@comcast.com...
> Jeff, thanks for the info, and I will work on the ground situation.
>
> But, as I said in my original post, I have put a new bulb in the left
> brake
> light, so I doubt it is a bad one.
>

That is not a safe assumption, I have taken out a bad bulb and put in
another bad bulb on many occasions. The trick is to test the bulb before you
put the lens cover back on.

Take the lens cover off of BOTH sides, then take a known good bulb and put
it in the offending socket. If the problem follows the bulb, then the socket
is needing attention, if the good bulb works on both sockets, then the
offending bulb is bad.

There are two filiments inside the bulb, one for the running lights and
another for the brake lights. Use a multi meter, or multiple bulbs and
sockets, to test the integrity of a bulb. If a bulb works in one socket but
not another, then the offending socket is the problem, if the bulb fails in
more than one socket, then the bulb itself is bad. The common point on both
bulbs and sockets is the ground, which is the case of the bulb and the
outside of the socket.

 

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:q_GdnVZ8neaGKPbfRVn-iQ@comcast.com...
> Jeff, thanks for the info, and I will work on the ground situation.
>
> But, as I said in my original post, I have put a new bulb in the left
> brake
> light, so I doubt it is a bad one.
>

That is not a safe assumption, I have taken out a bad bulb and put in
another bad bulb on many occasions. The trick is to test the bulb before you
put the lens cover back on.

Take the lens cover off of BOTH sides, then take a known good bulb and put
it in the offending socket. If the problem follows the bulb, then the socket
is needing attention, if the good bulb works on both sockets, then the
offending bulb is bad.

There are two filiments inside the bulb, one for the running lights and
another for the brake lights. Use a multi meter, or multiple bulbs and
sockets, to test the integrity of a bulb. If a bulb works in one socket but
not another, then the offending socket is the problem, if the bulb fails in
more than one socket, then the bulb itself is bad. The common point on both
bulbs and sockets is the ground, which is the case of the bulb and the
outside of the socket.

 

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:q_GdnVZ8neaGKPbfRVn-iQ@comcast.com...
> Jeff, thanks for the info, and I will work on the ground situation.
>
> But, as I said in my original post, I have put a new bulb in the left
> brake
> light, so I doubt it is a bad one.
>

That is not a safe assumption, I have taken out a bad bulb and put in
another bad bulb on many occasions. The trick is to test the bulb before you
put the lens cover back on.

Take the lens cover off of BOTH sides, then take a known good bulb and put
it in the offending socket. If the problem follows the bulb, then the socket
is needing attention, if the good bulb works on both sockets, then the
offending bulb is bad.

There are two filiments inside the bulb, one for the running lights and
another for the brake lights. Use a multi meter, or multiple bulbs and
sockets, to test the integrity of a bulb. If a bulb works in one socket but
not another, then the offending socket is the problem, if the bulb fails in
more than one socket, then the bulb itself is bad. The common point on both
bulbs and sockets is the ground, which is the case of the bulb and the
outside of the socket.