Trying to hook up the door trigger to my viper 5901 and something is not correct. 2010 F-150 has four door trigger wires that are normally grounded when closed. I have seen many peoples wiring diagrams but none are correct. Connecting diodes does nothing because the wires are NORMALLY grounded so how can you see when one is not grounded?

 

The wiring diagrams are correct. The Vipers come with two Door Trigger wires, they are (+) Door Trigger H1/6 and (-) Door Trigger H1/8. The Ford Door Pins should only be ground when open so you should use H1/8 (-) Door Trigger.

You just need 4 diodes from the 4 trigger wires to that one wire as such:

DF wire:-------|<---------|
DR wire:-------|<---------|----------H1/8 (-) Door Trigger
PF wire:-------|<---------|
PR wire:-------|<---------|
```````````DIODES

If for some reason Ford decided to wire you truck the other way around I suppose you could try tying them all into H1/6 (+) and see if that works.

 

Ford is wired ground when closed. Open circuit when door is open. Thus diodes cant help me.

 

Does your truck have keyless entry?

 

Yes I have keyless entry too, but I know that will not work with the alarm

 

That's strange that your showing (+) when open and (-) when closed then. How are you testing the output of the wires and have you tried wiring it up yet?

 

Test the wires at the smart junction box and the shop manual show grounded when closed, open circuit when door is open. So I have not hooked it up yet.

 

Are you sure that your testing these wires?



If you are I would say that your just going to have to trust the rest of us that it works that way.

 

Those are the wires, have you tried to open each door with the alarm armed and see if it goes off? Roll the window down and open the door when its armed. They are normally grounded so I ......confused.

 

I have had the alarm installed for a couple months and can tell you that it works exactly like it should. Alarm goes nuts if any of the doors are opened. Are you using a multimeter to check the voltage? It should be infinite or zero with the ground probe touching the frame and the positive probe touching any of those wires when the door is open.