fog relay/ oem momentary switch

Newbie here. Very  and informative site. Looking for a little help with installing my fog lights on my 99 Silverado. I've attached a link of the factory wiring diagram. https://il88.photobucket.com/albums/z64/IMI4tth3w/foglightelectricaldiagram.gif

I am attempting to bypass the BCM(body control module). I believe that I need to install a "Latched on/off" relay(as noted on this site). https://www.the12volt.com/12voltimages/latchonoffspnd.gif

I am not sure if this is correct, because it appears that the factory relay is receiving a negative ground input from the bcm, and the latching relay would be providing a positive input according to the diagram.

Any ideas on how to properly accomplish this would be greatly appreciated. BTW, I would prefer to not use diodes.  

hi,

the link doesn't work (at least for me).  and yes, you can convert a negative pulse to a negative output with a latching relay.  do you need to have a negative output?  an old VW headlight relay will do what you are trying to accomplish although with a positive output.  the relay is rated for 150W, good enough for two fog lights (55W bulbs of course)

m

running with sissors 'cause i can

themodifier wrote: I would assume by the lack of response, it is impossible to convert a negative pulse into a constant negative output via relays??

it is absolutely possible. you are not getting much response because your link does not work.

have you looked in the "relay" section at the top of the page yet? im assuming you are not getting many replies because there are already diagrams there to do just what you are wanting (provided you are willing to use 6 relays because you dont want to use any diodes). either that or purchase an electronic latching relay.

https://www.the12volt.com/installbay/forum_posts.asp?tid=110908&KW=ckeeler&tpn=1