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How to wire multiple leds for car alarms?

  #1  
Old 06-10-2006, 11:18 PM
Thread Starter
Join Date: May 2006
Posts: 22
Default How to wire multiple leds for car alarms?

I installed a Viper 791VX into my 97 accord. I have had 3 leds running off the brain for some time and was looking to add more. I know that after 3 leds, a relay must be used to power up the remaining relays, so here is what i tried.

1st attempt:
1. run one led off the brain
2. take a 451M 5 wire relay and put thick purple and skinny red to 12v, skinny green to the orange wire off the brain (ground when armed wire) and have the green/blk wire remaining. Didnt use White/blk, Brn/blk or skinny blue wire.
3. Wire the 4 leds in series
4. use the grn/blk as the positive for the leds and just grounded the neg. to the vehicle.

This worked and the leds were extremely bright, but did not pulse like the on running off the brain....because of the orange wire i was gettin the input from was throwing a constant ground instead of a pulsing signal. So i talked to my fellow installers and came up with this...

2nd attempt:

1. run one led off the brain
2. take 451M 5 wire relay and put thick purple and skinny red to 12v, skinny blue to the neg side of the led running off the brain. I also put a 3A diode in line to stop any backfeed from getting to the led off of the brain.
3. wire the 4 leds in series
4. use blue/blk as teh positive for the leds and grounded the neg side to the vehicle

This caused the single led run off of the brain to become extremely dim and unnoticable, and the other leds did not blink at all. I think that the current draw is just too much, but i am out of ideas on how to wire this up. The 451M relay is made by directed electronics. Any ideas on how to wire up the leds and get them all pulsing would be great!
 
  #3  
Old 06-13-2006, 08:07 AM
Been Around A Long Time Member
Join Date: Jan 2006
Posts: 1,475
Default RE: How to wire multiple leds for car alarms?

to have basic leds run off a 12 volt source you have to have a 360ohm resistor(ideal is 300ohm but they are still really bright with a 360ohm) and 3 led's all in series the basic led is 1.5 volts i believe
that is defined for a basic led strip for 3 led's

dim means no current draw, because if it were pulling a lot of current 1 the led's would be getting reeeeeally hot, 2 smoke could then follow

you have to use those princples to define the needed power to use your leds. whats the resistance provided by your relay which is intended for a car door for remote lock and unlock? second are you using the right set of wires off that relay pack?
 
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