remote starter to multiple ignition wires

Hi there, I am trying to get the Bulldog Deluxe 500 Remote Starter to work on my 97 BMW 540i. The problem is that my car has 3 (green) ignition wires. When I hook it up to only one of those ignition wires the car is cranking like crazy but wont run (start) the engine. I heard I have to use multiple relays to get it to work, but have no clue how. Can you guys please help me out? Thanks,

Use the H1/5 Ignition2 output to control 2 external 30/40A SPDT relays.

Wire as follows :

Relay1

Pin 85 to Chassis GroundPin 86 to H1/5 PinkPin 87 to +12V constant thru 20A fusePin 30 to 540 Ign2 GreenPin87A not used

Relay2

Pin 85 to Chassis GroundPin 86 to H1/5 PinkPin 87 to +12V constant thru 20A fusePin 30 to 540 Ign3 GreenPin87A not used

Here is an install guide for another brand R/S with the diagram on Page 10 :  http://www.readyremote.com/pdf/manuals/24921.pdf

Soldering is fun!

kreg357 wrote: Use the H1/5 Ignition2 output to control 2 external 30/40A SPDT relays. Wire as follows : Relay1 Pin 85 to Chassis Ground Pin 86 to H1/5 Pink Pin 87 to +12V constant thru 20A fuse Pin 30 to 540 Ign2 Green Pin87A not used Relay2 Pin 85 to Chassis Ground Pin 86 to H1/5 Pink Pin 87 to +12V constant thru 20A fuse Pin 30 to 540 Ign3 Green Pin87A not used Here is an install guide for another brand R/S with the diagram on Page 10 :  http://www.readyremote.com/pdf/manuals/24921.pdf

kreg357, thank you so much for your help! I have (according the vehicle wiring diagram) H1/5 (Pink) already hooked up to the cars Ignition#2 (Purple) wire. Which receives also +12v when ignition key is on position "ON" or "RUN" and "START" or "CRANK" position. So, in this case I have 4 ignition wires (3 green and 1 purple). This a the wiring diagram for my car: http://readyremote.com/main.asp?action=select&yr=3262&product=Remote%20Start&make=BMW&model=5%20Series

I was thinking diodes instead, but I'd assume high currents are involved, else they'd have voltage drop issues. But reliability wise, I'd stick with relays. That's where typical ECU relays are good - eg, the JIDECO brown relay; one coil with 2 SPST contacts. Only one relay is then needed. (Though often harness-wired as a common input (+12V), these relays have 2 separate inputs - ie, a true dual SPST.) These are common in Japanese vehicles, but maybe not elsewhere? (I don't know of a Bosch/Hella equivalent, though I rarely deal with them...)

To power 4 ignition circuits and keep them all isolated, just add another relay to the diagram above.  The Bulldog Deluxe 500's Ignition 2 output will not be connected directly to the 540.  It will control the 3 relays and the relays will connect to the vehicles ignition circuits.

Relay3

Pin 85 to Chassis Ground Pin 86 to H1/5 Pink Pin 87 to +12V constant thru 20A fuse Pin 30 to 540 Ign4 Purple Pin87A not used

Soldering is fun!

Yes the vehicle's VIOLET (PURPLE) must be connected as an ignition wire. No Peter relays not diodes, too much current. This is the only vehicle I can think of like this, no other BMW and I've absolutely no idea why. Brain fart by the designers?

Bulldog Tech Support just called me back saying: - Use Ignition#1 (H1/4)(yellow) from RS to TWO (2) green Ignition wires without any relays on 540i - Use Ignition#2 (H1/5)(Pink) from RS to Purple Ignition wire on 540i - Use Ignition#3 (H7/1) (Blue/Black) which is a negative using a relay to make it positive to the 3rd green wire on 540i. What do you guys think about that? I will definitely try your recommendations first since I like the idea of having everything isolated from each other. Thanks!

Isn't blue/black the starter not ignition? Sorry not relevant. Or just 1 output + X no of relays. E.g. 4 wires = 1 output into 3 relays.

This simple:- 5_series.bmp I've used the original car and R/S colours

howie ll wrote: Isn't blue/black the starter not ignition? Sorry not relevant. Or just 1 output + X no of relays. E.g. 4 wires = 1 output into 3 relays.

no, starter wire is black\yellow and 97 BMW 540i has four (4) ignition wires (1x purple and 3x green)