Help! Need relay wiring diagram for 6 volt positive ground fog lights

[rrunnertexas]

I would like to install a pair of vintage 6 volt fog lamps onto the bumper of my 1935 Plymouth, which is 6 volt positive ground.  This can't be that difficult, but positive ground messes with my head.

 

Can someone please send a relay wiring diagram for this?  The relay is the 5 terminal type, designed for 6 volts.

 

Thanks!

David

 

 

[Plymouthy Adams]

have you even considered looking on the internet.....you have typed way more above that needed to find your answer.  Battery is just that a battery, the relay or vintage incandescent lamps care not the polarity of the battery.    

[rrunnertexas]

Yes, I have spent 30 mins looking for a diagram and all are negative ground.  OK, I'll keep trying to wrap my head around positive ground.  It is not that difficult.  

[Plymouthy Adams]

again, polarity is not a factor, you state 6 volt version of the bosch 5 pin relay.  notice energizing coil  pins 86 and 85 are NOT marked for polarity also notice the pin 30 and 87 (NO normally open) switched contacts are not marked  IN or OUT....you will not use pin 87a (NC normally closed) in the center and can break it off if you want.   

 

Further you can copy a drawing from the internet, take a pencil and erase the plus and minus on the battery and reverse these marking....Bob's your uncle.

Edited August 9 by Plymouthy Adams

[rrunnertexas]

OK, so sounds like this can be wired just like the diagram for positive ground?

 

 

[Plymouthy Adams]

you confusing the thread, first you ask for a positive ground diagram as you could not find one, tell you how to do thjs by using the negative diagram and then just reverse the polarity marks on the battery....and now you compare that to the diagram for a positive ground which if you already had this diagram, what is the question.

 

 

25 minutes ago, rrunnertexas said:

OK, so sounds like this can be wired just like the diagram for positive ground?

 

 

 

[desoto1939]

Look for a 6 volt single headlight relay you do not need a dual 6volt relay since you will only be supplying current to single bulb light and not a high and low beam situation.

 

So look for a single relay 6 volt on ebay or at a swap meet Most of these being solfd usually have an instruction sheet.

 

One wire will come from your switch or toggle switch to turn on the fog lights from inside the car.

One wire will come from a connection from the battery to supply current to the relay use a 10 gage wire.

One wire also 12 gage will then run out to the foglights might want to run this  power wire to a new seperate junction box light what youhave for your regular headlights

This wire then is attached to the stud and the two wires from the foglights are also attached to this same stud.

Turn on the ignition switch and then turn on the switch to the foglight and they should work turn off the foglight switch and they go off and then turn off the ignition the foglight switch if turned back on should not even supply electric to the lights.

 

I have this same setup on my 39 Desoto .

 

Rich hartung

Desoto1939@aol.com 

[JBNeal]

additional information - headlight relay wiring diagram download

[Sniper]

11 hours ago, Plymouthy Adams said:

have you even considered looking on the internet.....you have typed way more above that needed to find your answer.  Battery is just that a battery, the relay or vintage incandescent lamps care not the polarity of the battery.    

 

DC energized relays use a diode to control what is called the flywheel/flyback effect.  So they are indeed polarity specific.

 

Flywheel occurs when the coil de-energizes and the magnetic field collapses inducing a voltage, much like how the ignition coil works.  The diode is there to short that flywheel voltage out so it doesn't cause noise or issues int eh electrical system.  Being that our stuff is relatively crude this effect doesn't really apply, except that the diode is generally built into the DC relay and if you wire it incorrectly the diode will short out the control voltage rather than the flywheel voltage.

 

https://en.wikipedia.org/wiki/Flyback_diode

 

Usually, the relay will have a graphic on the case showing a diode, in the picture below it is the right pointing triangle and line between 85 and 86

 

[Plymouthy Adams]

you are correct some do but the Bosch square box automotive does not as they are not shown on the relay drawing.....so my reply was tailored around his stated choice of components.....funny you show this 200 amp relay, I utilized one of them in my recent Brit car build that only had two fuses total when I added an additional 8 fuses and powered the fuse panel from the ignition switch through this heavy relay.  200 was overkill but I liked the lugged terminals.   I added lots of modern electrical features and brought the car into the correct century.  

[Sniper]

I just used that pic because the graphic was clear and readable. 

 

Some Bosch relays do have the diode, just have to be ware is all.  Since the OP never said Bosch and didn't give a brand or part number of what he has, who really knows.

 

 

Edited August 10 by Sniper

[lostviking]

Simple answer, the lamps and the relay don't really care if you car/truck is pos or neg gnd. IF the relay has polarity shown, like the picture above, pay attention to it. Otherwise, it's just a electronic switch, so don't over think it.