Anyone know where I can get a SPDT mercury switch?

picone239

Member
Jul 22, 2010
274
Paramus, NJ
Looking for a SPDT mercury switch to control my rear lights. Ideally, once the back hatch is opened, the headliner mounted bar would shut off, and lights mounted to the hatch would turn on. Do they make mercury switches for this application at a reasonable price, or should I just go with two mercury switches (one in the closed position, one in the open position with the hatch closed)?
 

blackcherryxj

Member
Jan 1, 2011
165
Western Kentucky, USA
You could hook up the mercury switch to a bosch style relay. Wire the bar light to the normally open position on the relay and the other lights on the normally closed to where when the switch is activated, it swaps what has power on the relay.


If this doesn't make sence I hope you make the idea. Been a long day at work.


Paul
 

lite-em-up

Member
May 23, 2010
116
Eastern Missouri
blackcherryxj said:
You could hook up the mercury switch to a bosch style relay. Wire the bar light to the normally open position on the relay and the other lights on the normally closed to where when the switch is activated, it swaps what has power on the relay.

If this doesn't make sence I hope you make the idea. Been a long day at work.


Paul


^^^^^^ +1 ^^^^^^


You're not going to find a mercury switch that is SPDT. I don't think there is such a thing.
 

Fast LT1

Member
May 24, 2010
2,018
Sedgwick County, KS
blackcherryxj said:
You could hook up the mercury switch to a bosch style relay. Wire the bar light to the normally open position on the relay and the other lights on the normally closed to where when the switch is activated, it swaps what has power on the relay.

If this doesn't make sence I hope you make the idea. Been a long day at work.


Paul

This is the only way i've found to do it, as i've never seen a single pole double throw mercury switch.
 

EVModules

Member
May 16, 2010
864
Deer Park, WA
#30 & #85 to switched power source that powers the headliner & hatch lights.


#87a to one set of lights


#87 to the other set of lights


#86 runs through the mercury switch, to ground.


Depending on the mercury switch position, you may need to configure the outputs appropriately.
 

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