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99 mustang convertible top won't go up or down. No noise…

Customer Question
99 mustang convertible top...

99 mustang convertible top won't go up or down. No noise coming from pump or motor. Previously it would go down and not back up.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

I just bought this vehicle. When I first tried to put the top down it worked fine on the way down.. It would not go back up. There was no noise at all when I pushed the button to go back up. Now it won't do anything when I push the button. No noise, doesn't attempt to do anything.

Submitted: 2 years ago.Category: Ford
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Answered in 42 minutes by:
2/27/2016
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 7,073
Experience: ASE Master Certified, ASE Advanced Gasoline Engine Performance
Verified

If the convertible top hydraulic pump did not make any noise, the problem is either the switch or the relays. You will need a test light or digital multi meter to do a few electrical tests. Please let me know if you have either of these.

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Customer reply replied 2 years ago
I have both.
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Ok. You can either remove the rear seat bottom and back cushions to access the convertible top motor and relays or go through the trunk and remove the inner panels to get to it.

The is a circuit breaker in the engine bay fuse box that sends power to the relays and fuse #20 in the dash fuse box is power to the switch.

Below is the wiring diagram for the top.

Make sure both relays have power on the RED/LIGHT GREEN striped wire with the key turned on. Then we will have to check for power from the switch to the relays after that.

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Customer reply replied 2 years ago
I have replaced the circuit breaker in the engine bay and fuse #20. Would it be easier to check for power to and from the switch before pulling the seats out?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

You can.

Fuse #20 sends power to the switch and the switch sends power to the relays.

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Customer reply replied 2 years ago
Are there only 2 wires at the switch? If not how do I check for power?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

There should be three wires at the switch.

White/Pink striped

Violet

Gray/Light Blue striped

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Customer reply replied 2 years ago
A simple switch would have power to one wire and power to the second once the button is depressed. What am I in for here? Also how does the switch come out will it pop out if carefully pried out?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Gently pop it up. One wire will have constant power, one wire will have power when the switch is pressed down and the other wire will have poser when the switch is pressed up.

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Customer reply replied 2 years ago
Got it. Now let's say there is power there. I then would remove the back seat and check for power where and in what succession? Is there one relay for up and one for down?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Look at the diagram I posted. There is an up relay and a down relay that send power to the pump motor when the switch is pressure for raise or lower top. Power goes from the switch to the up or down relay to energize them.

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Customer reply replied 2 years ago
Ok. I'm on the east coast and it is dark and I don't have a garage. I'll be doing the diag work tomorrow. Will you be avail if I have any further questions?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

I am in Florida, so I am in the same boat as you. I'll be on line tomorrow during the day.

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Customer reply replied 2 years ago
Great thanks for all of your help. On another note this has a 3.8 is there anything I can do to get more hp from this engine? I see these chips you can buy that claims to add 100 hp. Is that for real? If not what can be done without opening the engine?
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Cold air intakes, better exhaust. The chips will require the proper programing tune that only performance shops can do properly. And 100 HP is just a claim, especially on the 3.8L V6.

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Customer reply replied 2 years ago
That's what I thought. Thanks for confirming.
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Your very welcome.

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Customer reply replied 2 years ago
I have power at all three wires at the switch. I then pulled the switch out and tested the wires at the connector. There is power at all three wires at the connector with the switch unplugged? This is puzzling to me as I expected constant power to only one wire.
Customer reply replied 2 years ago
According to the schematic the white/p wire is the constant hot connector. I pulled the switch out and connected a jumper wire from the battery to the center pin of the switch is where the w/p wire connects to. I then tested each of the remaining pins on the switch and each of them light up when the switch is depressed. The up button lights one pin and the lower button lights the other so the switch appears to be in working order. I'm still puzzled as to why there is constant power at all three wires at the connector without the switch in place.
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

Pull the circuit breaker for the top which is in the engine bay fuse box. Then check for power on those wires.

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Customer reply replied 2 years ago
There is only power coming from the w/p wire as it should be.
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago

You will need to check the wiring at the relays and the top pump motor behind the rear seat in the trunk. Unplug the motor first and do the check with the circuit breaker back in. Then unplug the 2 relays and retest.

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