87 ford ranger, 91 explorer, door locks

I have an 87 ford ranger, and a 91 ford explorer.  

I have installed my alarms in both vehicles with the exception of the power door locks which has always confused me, Its like algebra I can see it, i can be shown it and in the end it just wont sink in.

My alarms have both + and - trigger wires  but I cant remember the process for the fords   ie relays, no relays, direct connect...     so any assistance on this would be appreciated.

Thanx, Mike

1987 Ranger: ( usually the manuf. recommends Relays for Door Locks. )

Negative Pulse Door Lock Diagram. * It Is Common For Lock & Unlock Wire Colors To Reverse

1991 Explorer: ( usually the manuf. recommends Relays for Door Locks.  Also if you have to do Reversal you will need 2 Relays & wire as Below)

This is 5 wire Reversal:
2 SPDT RELAYS:

Cut LOCK  & UNLOCK Wire in Half.
One Half goes to SWITCH
One Half goes to ACTUATOR

Relay 1

LOCK:
PIN 87 =  12 Volts ( + ) Constant
PIN 87a =  wire from Door Lock Switch
PIN 30 =  wire to Actuator
PIN 85 = Negative Lock Output from Alarm
PIN 86 = Constant 12 volt ( + )

Relay 2

UNLOCK:
PIN 87 =  12 Volts ( + ) Constant
PIN 87a =  wire from Door UnLock Switch
PIN 30 =  wire to Actuator
PIN 85 = Negative UnLock Output from Alarm
PIN 86 = Constant 12 volt ( + )