when left indicator only is turned on and flashs okay why do brake lights flash? v cavalier 1990 g 1.6l

andy n, December 2007

possibly earth / connection fault. do as clive says to the plastic plug on the end of the wires. you will need to disconnect the plug and blow it out / clean it/ try to scratch any rust or deposits of of the metal contact with a screwdriver. this will help to ensure a better contact.
in addition, where all of the bulbs screw into will probably be a plastoc board with metal strip connectors. if you see any greenish rusty deposits on it, clean them off. also give the board a spray with a penetrator like wd40 or some cleaning solvent.

hope all goes to plan

markkoz, December 2007

Hi Andy, common fault on many modern cars. You will find it's just a poor connection. Find the plug connector located on or near the light cluster, unplug it and douse it penetrating oil, work the connector on and off a few times to work the oil in. This usually does the trick.

Clive, December 2007