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1978 Mark V Door Lock Issue & Follow Up

Hi Bill,

We have talked a couple of times and I am happy for the help and parts you send me. I do still have a problem with my door locks. I have looked in the manual under 44-16 about the lock actuators and as I understand it the actuators can move both ways is that correct? In that case the actuator should receive reverse polarity power depending whether I'm locking or unlocking the car. I only get power to the actuator when I unlock the doors so where do you think my problem is? Switch? Is there a relay?

Sincerely,

Tim

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Hi Tim -

If I understand correctly you have no locking operation at all from either switch. I would begin by testing for output power from either switch in the lock and the unlock position. The ground for both lock and unlock for both doors appears to be at two contacts in the drivers door switch. One of these ground points inside that switch could possibly be faulty in my opinion if there is no locking at either door from either switch. This type of issue is where your wiring diagram is a real asset in order to understand how the power is sent to the lock motors and how the ground circuit from the motor operates. If you understand the wiring diagram, the drivers switch could be bypassed in order to verify an internal fault or sent to us for testing. Do some tests and let us know what you find and we will proceed further depending on what you find.

Sincerely,

Bill
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Hi Bill -

That did the job. I found out that one of the contacts/switches was corroded and that was an easy fix. All the switches is now cleaned.

While I have you I got a question more. I haven't had my car on for the last couple of weeks and was working on it today for 5 hours. The sun was up and it was around 85 F outside. I noticed that the car was dripping fluid. It was right under the transmission and it seems to be water. Its clear and doesn't have any color to it. I was doing that all day and it was a lot.

I followed the source and found out it came from what felt like an end of a hose just underneath the windshield wipers behind the engine but the hose was coming from the cabin is my guess. Is this normal? I know an AC drips but that is when it's on or after it has been running.

Kind regards,

Tim

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Tim -

I cannot tell from here what that hose looks like. Please send us clear pictures and we may be able to identify it for you. If it is near your wipers as you post, perhaps it is a windshield washer hose that has cracked and slipped off a connector and the heat of the day has expanded the liquid in the washer system hoses and caused it t leak out.

Sincerely,

Bill