Re: brake light switch

Posted by Randy Berger On 2011/1/11 16:39:28

I cut open the switches that went bad on my 400 where I use silicone fluid. The electrical contacts were burnt and corroded with carbon which inhibited the flow of current. This occurred on a Packard three terminal switch and also a two terminal switch that in addition to lighting the brake lights, turned off a normally closed relay that supplied current to the TL system. When cut open the failure was very noticeable. Either drops of silicone worked past the seal or some gaseous discharge of the silicone worked past the seal.
Installation of Howard's suggestion of a GM mechanical switch resolved the problem.