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diy cheap asian style car underbody lights

Step 8_ STEP 7.5

_ STEP 7.5
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this is optional. for people who want more options with the lights

it is quite difficult to illustrate step by step how to wrire each wire due to the vast difference between car models and makes. but if u made it to this step, im pretty sure that you are capable to wire it without mistakes. at times like this, a multimetre is ur friend.

but what this is is a switch.this controls the lights.
the modes are:

-ON- constantly
-ON- when unlock door with remotes and OFF when lock door
-OFF- when unlocked and ON when breaks are applied, no matter if car is running or not.
-OFF- open circuit, no lights at all (incase gets pulled over by cops or if dont want it on)

an off swich is a good idea if u dont want ur A$$ mugged when u drive (or park) in dodgy areas of town.

this will be easy if u have a proper 4 state switch. i dont have that at the moment. so i used 3 seperate switches. i bridged the switches so that it only functions one function at a time.

the reason why i used a relay was for 2 reasons. if too much load is on the break light wire. it will dim the break lights. 2nd reason is the click the relay makes when swiching. this is useful so u know that its switched in the "break light " mode. obviously, u wont drive everyday with the "breaklights mode" on and the noise isnt that loud either. so its a pretty good idea.

i used expoy to stick the switches to make all of this 1 unit. make sure not to get any in the swiches. or else u have a switch that is stuck.

for my particuar car, the 12v stays live on the roof light wire and the gnd is the swich, which totally screwed up my "constant light" function. i added a relay to short the "gnd" to a real "GND". this makes it constant on. even with the keys out and doors locked.

after u are finished, check if it works. if smoke comes out, ur stuffed. if u hear a pop, most likely a fuse blew, check ur wiring. if it lights up, congrats, u finished the tough step.
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1 comment
Jan 6, 2010. 9:11 PMhowry says:
cgi.ebay.ca/1-Stainless-DPDT-ON-ON-Blue-Light-Car-Switch-12V-B22ZE_W0QQitemZ290387069234QQcmdZViewItemQQptZLH_DefaultDomain_0you were tlaking about the switches at this step, is there a way to have a switch that way that when the doors are open the lights are on,  and add to that you have on and off as well when the doors are closed? would you say that its 3 way or 2 way? cuz ive found a really nice switch that will look good inside.  
Jan 28, 2010. 9:16 AMneilo510 says:
you could accomplish that via relay. Run your hot power constant to the relay, signal wires from your door switch and also from your on/off switch to the energizing side of the relay and when one or the other is switched on or (door open) it will close the circuit and turn the lights on when wired to the energized side.

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