QuestionQUESTION: I'm restoring a 1988 Ford F250 4x4 7.3 Diesel Truck. Its already been broken into once, so I thought I'd go ahead and install an alarm as well as have the convienence of keyless unlock/lock entry.
I've got almost everything figured out as far as wiring installation goes, but I've read some conflicting information as far as the correct wiring for the door locks, and came across some BOLD typed information on the manufacturerss page stating that incorrect hook up to the door locks can damage the control unit.
So I figured its best to play it safe and get an experts advice. The control box has the standard green and blue door output wires, but could you please advise me as to where I should conect these two wires. (Drivers side switch, Passenger side switch, and to which existing wire color etc...)
I think what has occurred is I did so much research into this particular part of the installation, that I just confused myself and am overlooking the obvious solution.
Thanks in advance for your help on this matter
Brian
5 WIRE REVERSE RELAYS
ANSWER: In this truck, the door lock type depends on the OEM equipment
that came in the truck from Ford.
If it has the FORD OEM keyless system built in,
then these are 3 wire negative door locks. This would mean
you could directly attach the negative trigger lock or unlock
wire from the alarm, directly to the pink/yellow
or, pink/light green wires in the truck (found up high in
the drivers side kick panel area going out to the drivers
door switch). However, if this vehicle did not come equipped
with a FORD OEM KEYLESS system, these locks would be the 5 wire reverse
type system, and would require 2 relays to wire them
for use with your alarm system.
Have a look at www.relayhelp.com at the 5 wire reverse locks diagram
I made there, and apply if yours is without FORD OEM keyless.
If it does have a 3 wire negative system, here is a fast way to test.
Locate the pink/yellow lock wire I suggested. Then using a simple test
light, (NOT A MULTI METER!) ground the aligator clip to
a good solid chassis ground point, then probe that wire.
(touch copper with the tip of the grounded test light momentarilly)
When you do, if they were negative type locks, probing it would physically
lock the doors once it receives the ground pulse. Same with the unlock
wire. Then it's a straight connection for the green and blue wires
designated on your after market alarm.
However, if nothing happens when probed, but the test light shows
12 volts when you hit the door switch to lock/unlock,
these are 5 wire reverse door locks, and need to be relayed.
Now you have the info need to complete the task.
Good luck with it.
ALARMTEK -
RELAYHELP.COM
CARALARMSTORE.COM
---------- FOLLOW-UP ----------
QUESTION: Thank you for the detailed explanation. I will test the connections as you suggested. I do not believe the OEM set up came with the Keyless setup, but I am only saying this because upon inspection of the door lock mechanism, I see where each side (Driver & Passenger) have 5 connections to the door locking switches.
I attempted to view the diagram you referenced, however, the link is apparently no longer valid. I'm able to view the Relay diagram but not the door lock diagram.
If you could check this link for me.
Thank you again for the help and the extremely fast response
ANSWER: You must be an Engineer! lol. We get allot of
working engineers here that are always over thinking a
problem unitl it get's bigger! "Forest from
the trees" on this one I think.
www.RELAYHELP.com is not that deep of site.
Just an explaiantion of automotive relay applications.
For details and in depth graphics of the parts/equipment
for a given make, model & year of a vehicle,
try www.ALDATA.com
For now, only the relay application and pinout for the
posiioning of the wires to make your aftermarket
lock outputs work in this truck.
Let's focus on what makes them compatible
with what your doing, and wiring them
accordingly as opposed to why or how this works &
just keep it simple for this one.
Ok, www.relayhelp.com does work.
Just checked it, and there would not be a broken
down graphic of the lock mechanism there.
That's TMI for the work we do here.
Also, the ONLY way to know if it does indeed have OEM
keyless is my little test there. The ammount of
wiring at the switch does not give you a "tell" where
by looking at it, you can determine it's polarity.
The wire testing would.
Try this and if no relays are needed great.
If they are, try Napa parts or advanced auto
to aquire them. I sell them here for
7.95 a set (relay and socket).
A.
---------- FOLLOW-UP ----------
QUESTION: I wanted to first thank you again for allowing me your expertise. It is very appreciated because without it I'm fairly sure I would go crazy.
OMG, talk about confusing results. I did as you suggested and hooked the negative output of the alarm system to both relays. With it "T"d like that the door locks don't function at all.
So I tested it on each relay separately. Doing this, It locks the doors properly using the negative alarm wire to the lock side relay and also when turning the ignition key to start the doors will lock.
While the alarm is still alarmed and without openning a door I then moved the negative alarm wire over to the unlock relay and disengaged the alarm. nothing happened the doors stayed locked, but the system was no longer armed, but if I then arm the system with the negative wire still hooked to the unlock relay, the doors will unlock.
So all that got me thinking and I decided to do the same tests with the alarm positive wire hoping maybe the results will tell us something.
With the doors closed and the positive wire "T"d to both relays, nothing happens when arming or disarming.
With the positive wire hooked just to the lock relay, the system arms properly, and if while armed I move the positive arming wire over to the unlock relay and then disarm the system, the doors do unlock. Not sure how the ignition switch opperates locking and unlocking at this point, I didnt test because my brain couldnt handle anymore info at this point.
Do the above tests tell us anything?
Thanks
Answer
Relay explanation
Double checking the wires used:
POWER LOCK PINK/GREEN (TYPE C-5 wire) IN EITHER KICK PANEL
POWER UNLOCK PINK/YELLOW (TYPE C-5 wire) IN EITHER KICK PANEL
These are the wires you need to be on.
Cut them in half so you can work on them
and try again.
If not working after this time, there may
be a problem with the relays being used.
Make sure they are the attached type.
If pic does not show, see it at
www.RELAYHELP.com
