1968 for the electrically minded

[mbsf1970]

Just replaced all the rear bulbs on my car. When I apply the brakes, the middle bulb on the left bank of lights goes out and the other two bulbs get brighter...???

Stephen

 

[dalorzo_f]

First, take one of the good bulbs and swap it with the "bad" one to be sure its not the simple solution. :smile: (spent a lot of time chasing a "wiring problem" that was a bad bulb out-of-the-box a while ago!)

If its not the bulb, check the socket and bulb contacts. And for any fraying or a broken wire on the feed side to the bad bulb (bad source, bad ground).

I had one doing a similar thing... a clean up of all the connections "cured" it...

.. or you can rewire the car and apply LED's.... :wink:

 

[mbsf1970]

bulbs tested at time of install...all fine. Old and new bulb acted same way. No fraying in wiring.....

 

[franklinair]

I would suspect a poor contact: either the bulb socket to the housing (poor Ground), or the soldered tips of the bulb/socket connection.
The light assembly worked OK before changing the bulbs??

Neil

 

[mbsf1970]

Neil,
I can only assume all was well prior to light swap since i don't spend any time following my own car. It passed out of Province inspection so I can only assume it worked prior??
I swapped out the 1157's that were on car for the 2357's and I don't don't how much of a difference they make? My biggest concern is daytime travel...not night. I'll recheck and maybe sand contact points on bulb in question and socket end as well....

Stephen

 

[franklinair]

My primary concern/suspicion is the continuity between the tail light housing and the socket. They are only a crimped connection and if the socket isn't making a good connection, there is no Ground for the bulb.
Do you have an ohm meter? Verify that each socket shell reads 0 ohms to Ground.

Neil

 

[mbsf1970]

uh, no.....:sad:. for now it will go undiagnosed....must address starter problem first.