[bandit77]

Hi. I have a car alarm from Design Tech (#20930) installed in my restored 66 Mustang. I'm now trying to hook up the Starter Kill wire. To do so, it says I need a standard Bosch style SPDT (Single Pole Double Throw) 30 Amp relay. I've looked on the internet trying to find the right relay and any other parts I may need. This is what I found:

* 12VDC 5-PIN RELAY SOCKET w/DIODE (Pre-wired relay socket with diode across the coil. Designed for use with starter kill circuits. Three 12" leads. For use with 5-pin Bosch type relay.)

* 12VDC AUTOMOTIVE RELAY SPDT 30A (This Bosch type 12V, 30A relay is popular in automotive sound and security installations. SPDT. Plastic housing with mounting tab.)

* 12VDC BOSCH RELAY SPDT 30A (This 12V, 30A relay is popular in automotive sound and security installations. SPDT. Plastic housing with mounting tab. Bosch #0 332 209 150. Made in Germany.)

Do I need the relay and the socket, or just the relay? Do I need the diode? Also since I'd rather not disturb the condition of my restored Mustang, is it necessary to cut wires to complete this installation, or is there another way? I would appreciate your advise. Let me know if you need any other information. The installation manual is located at:
http://www.designtech-intl.com/pdf/m.../20630v4-1.pdf

Thanks,
Tom

[MgKenny]

Hey bandit77. I installed car stereos/alarms for 12 years (So I know what I'm doing). You can use any of the 3 relays you mentioned however, I would recommend the Bosch. They're bullet proof and over the years I have gotten some cheap imitations which crapped out (Leaving you stranded) because my boss at the time was a cheapskate. You do not need the diode. You do not need the base as it probably doesn't come with big enough wires for your purpose anyway. Just use the proper female "Stake on" connectors and put the wires directly on the relay. (Yellow colored connector for the starter wires you cut in half and blue for the coil leads coming from the alarm. Then just wire as shown.)

Also, is it a stick or an automatic? The reason I ask is that if you break the starter circuit on an auto no problem. If it is a stick, theoretically a determined theif could get your acc'y lead hot (By popping the ignition cylinder) and then push start the car (pop the clutch) and still drive away. Highly unlikely that they would go that far once they couldn't get it to crank but figured I'd let you know about this little loophole.

On a stick you could modify the circuit to cut off the fuel pump or kill the coil (On an older car which still had a coil) but i SERIOUSLY DISCOURAGE THIS as if the relay does malfunction while you're driving on the highway it could be disasterous.

Do yourself a favor and run all wires as high up under the dash and tie wrap them up so it makes it harder for a would be theif to disable it.

Let me know if you need any other help.

Ken