This is a DIY to Prevent thieves from making off with your Car. Since Car Theft is a Problem in Malaysia, This is a Sure way to confuse Criminals who prefer getting in and out Quickly.
Installing a fuel pump cut-off switch
One of the easiest security measures someone can have in the vehicle is a fuel pump cut-off switch. Not a mechanism that is wired into your alarm, because that can still be bypassed, but an actual switch inline with your fuel pump wiring. This is not a guarantee that your car will never get stolen, but if you hide your switch (or possibly switches) well, then it might deter a would-be thief. And for less than Rm30.00 and a little bit of your time, how can you go wrong?!
I am not responsible for any damage incurred to vehicle or individual. This worked flawlessly for me, but that doesn't mean something couldn't happen to you. If you are not sure get a Qualified Auto Electrician to complete this simple Procedure.
Here is what you would need :
- 25A Automotive rocker switch (I don't recommend the lighted switches, Why would you want a light on a switch you are trying to hide)
I recommend that a 25A switch be that absolute minimum you use for this application.
A relay could also be added to the Circuit if you are using a performance fuel Pump or if you prefer to be Extra Safe
18 to 14 gauge wire (the thickness of the wire is dependant on how far away you will be mounting your switch(s) from the original splice of the yel/grn wire. You can use the thinner wire if the switch is close to the point where you joined the switch) , I would recommend the Use of Primary Wire as opposed to Speaker wire , Speaker Wire is not Designed to Carry continous current , Primary wire is the wire that is used in most Automotive applications , and come in Different colours and Guages , It must be Noted that you should never use a guage of wire that is smaller than the guage fitted standard to the vehicle , When it comes to Wires , The Higher the Number the Smaller the Guage , so if your vehicle theoretically comes with 18g then do not use a 20g or 22 g (If Unsure Go to an Auto Electrical Specialist )
You can get relays at any Spare parts in the fog light section or just ask for a standard bosch 5 pin relay. You will only use 4 of the pins on the relay but usually the 5 pin version is more readily availible and usually cheaper then the four pin version. On the 5 pin you will not be using the middle pin, numbered 87A ( See Wiring Diagram )
- Crimp on butt connectors (Red) (these are useful if you don't feel like soldering, and they work just as well However Soldering is the Right way to Do this)
- Heat shrink-wrap or electrical tape
Other tools you may need
- 10mm open-ended wrench
- Wire cutters
- Needle nose pliers or wire crimpers (for crimping the butt connectors, if you use them)
Before starting to cut wires on the car, prepare the switch.
Solder on the wire you will be using to the Switch and cut the wire to a length which is much longer than required , It can be snipped Later when everything is done. When wiring a non-lighted SPST (single pole single throw) switch, the top blade is typically the POWER side or LINE side, meaning that this is where you solder the wire that will be running from the 12V battery . The middle blade is the LOAD side of the switch. Which means this is where you would be wiring the side of the fuel pump wire that goes directly to the pump. Check out the picture to see what I am talking about. This picture shows a lighted switch (Not a Good Option ), but it's the same principal. The RED wire is what will be used for power, the BLACK wire is the one going to the fuel pump side
Before doing anything, Disconnect the battery.
This is common sense.
First we have to remove the bottom cushion of the back seat.
1. Lay the tops of seat down like you would if you were loading something in the car.(For Civic Only, Other Cars Establish where your Fuel Pump is and work from there)
2. Pull up the fabric that covers the spare tire. Pull it up enough so you can see the bottom of the back seats, like in this photo.
• Use your 10mm wrench on the single bolt in the back. It can be somewhat of a pain to get to.
• After you have that bolt removed, pull the tops of the seat back up and get inside the car.
• Pull the cushion up by the front first. You will have to lift up and pull back, as there are little hooks holding the front of the cushion in.
• After you are done you should see this:
Now Comes the Cutting and splicing of the Wires to Connect the Switch
1. Pull the little bit of carpet back if you need to, and unwrap the wires.
2. Find the YELLOW wire with a GREEN stripe
3. Cut it where ever you like.
This next part is assuming you already have your switch mounted where you like it, and the wires run.
1. Strip about 10/15mm or a little more off the ends of the wires.
2. If you are using shrink-wrap, make sure to put in on now.
3. Insert the appropriate wires into the butt connectors (SOLDERING IS A BETTER OPTION) POWER wire goes to the part of the YEL/GRN wire running up front, LOAD wire goes to the YEL/GRN wire going to the pump.
4. Then they will look like this:
If you wish to add a Relay , Use this Wiring Diagram to guide you through :
5. Now wrap up the connections neatly.
6. Put the rear cushion back in place. You might need to bump the front of it around to get the hole lined up in the back for that 10mm bolt.
Time to test. Hook the battery back up. Flip the switch to the ON position (the "|" position), and start the car up. If the car starts up that means everything is wired up correctly and nothing has blown. Now flip the switch to the OFF position (the "0" position), the car SHOULD stall out and you won't be able to start it back up with out flipping the switch back on.
If the car doesn't start with the switch in the ON position, you may have blown a fuse. Check the number Fuel Pump Fuse.
t's normally a 15A fuse, but I switched mine to a 25A just in case.
That's it. You can see how easy this can be!
It is advisable to hide the switch somewhere thats easy for you to reach but difficult for a criminal to Identify , You are only limited by your imagination. ALSO, you don't HAVE to cut the wires where I cut them. The wiring for the pump runs along the driver's side door sill, so all you would have to do is pull up some carpet to splice a wire in there, JUST REMEMBER IT'S THE YELLOW/GREEN wire! If you are feeling Unsure , Just Visit an Auto Electrician , They could wire this Up in Under 20Mins.
Hope this helps to keep a few cars safe , So next time you Park , Flip the Switch and Leave knowing that your ride will be there when you return and it will go a long way in keeping those bastard thieves guessing .