Join Date: Dec 2002
Location: Saint Louis, Missouri
If you are unsure about the wiring, don’t guess at it. Some door lock systems require external relays while others will not. Some door lock wiring does not require cutting the factory wiring and just piggy backs on top of it while others require wires to be cut apart and separated. If the directions are not clear as to what type of outputs are coming out of it for the door locks then you could power the system up and then test out the wires to see if they are a negative output or a positive output. The only thing is you won’t be able to tell how much current they can handle and this is part of the reason for external relays.
Some of the systems out there also have internal jumpers that allow you to change features or polarities to work more with the vehicle it is being installed into.
As far as wiring, make good connections especially for the grounds and power and make sure things are fused properly.
Normally the trunk output wire will require a relay to wire to the trunk solenoid. The starter or ignition interupt relay needs to be of a good quality like a Bosch or Potter Brummfield. The off shore relays with only 4 terminals on them are a lot of times cheap and not real reliable. If you do wire up the starter or ignition interupt try and make it to where you are using the normally closed contacts. When the system is tripped it will open the contacts and not allow the car to start or run but should a failure occur with the system, the main fuse can be removed and allow the car to start. If you use the normally open contacts then a signal has to be sent to the relay to allow the car to start or run.
The parking light wire also needs to be on the parking lights and not the dimmer circuit.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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