wire keyless entry system for other use

You might have a cost factor involved but running a DC-DC converter might be better or cheaper in the long run to swap your servo for a 12 volt version. If you put a resistor on both motor wires, I've a feeling it won't work, though for the cost of a resistor it's worth trying.

Plan be would be to keep the keyless entry on 12 volts, reconfigure the lock outputs to neg, run a pair of relays from a 5/6 volt power source to the motors, that's the safest bet, see diagram:- servo.bmp

It won't matter. Resistors don't resist voltage, the resist current. You're keyless entry system is still getting 12vdc, it's just limiting the current to 363mA. If you put a resistor on both motor leads it would be the same as putting a 66 ohm on one lead - reducing current to 181mA. In an ideal scenario you would have a secondary 5vdc power supply (like a 7805) and then use NPN transistors to drive the (-) sides of the motor at 5vdc. A few more components but you'll be able to run the motors at their rated voltage without having to reduce their current.Kevin Pierson

Thanks for clearing that up Kevin, I KNEW that somewhere there was a reason for not using a resistor, apart from the fire risk, so effectively my diagram was correct, using the relays to switch 5-6 volts.

In fact if it is a 6 wire internal relay driven unit, our poster might get away without external relays. Could the poster give us the lock wires, colours and status please?

I hope this image post comes out right. I also have a video of it working at:http://youtu.be/dZ46dPnjlgU My last question at this point regards the use of 1 resistor on the + battery lead or using 2 resistors (one on each side of servo motor lead)? If my memory serves me correctly.... from the system I've wired as such: black to batt neg, red to batt +, pink and purple nothing, yellow and yellow/black to neg/ground, orange and ORANGE / black to pos, my servo motor one to white and other to WHITE/ black. I did not use relays. My resistor is currently inline to the batt + 5 Watt 33 ohm. Leave it here? is it the right size? or put two of them on the servo leads? Below are some specs on the servo (though it has been modified) Please advise on use of proper resistor. FYI- the motors seem to be able to handle the full 12V car system but after a couple of turns the metal geared motors just destroy the inner gearing on the servos. Again- thx much for help. Control System: +Pulse Width Control 1500usec Neutral Required Pulse: 3-5 Volt Peak to Peak Square Wave Operating Voltage: 4.8-6.0 Volts Operating Temperature Range: -20 to +60 Degree C Operating Speed (4.8V): 0.19sec/60° at no load Operating Speed (6.0V): 0.15sec/60° at no load Stall Torque (4.8V): 42 oz/in (3.0 kg/cm) Stall Torque (6.0V): 51 oz/in (3.7 kg/cm) Current Drain (4.8V): 7.4mA/idle, 160mA no load operating Current Drain (6.0V): 7.7mA/idle, 180mA no load operatingstone

We told you NOT to use resistors, it won't work, also a super fire risk if not fused. Stop getting wrong ideas, read what K.P. and I wrote, take it in and your problem will be solved.