Yes - the button on dash activated the relay switches ( I can hear them click on ) but motor does not work unless it’s banged on - I have read the brushes get stuck in motor and need a jarring to free them up - btw anyone opened these motors and tried some contact cleaner on the brushes?
You may have a voltage drop problem across a relay or connection. Use the test path below to find problematic connections and components.
Voltage drop testing of connections and grounds.
Use a Digital Volt Meter (DVM) to measure the voltage drop across a connection or wire. Adding length to the test leads may be required, and does not affect the accuracy of the test. Use 16-18 gauge wire for the test leads if you have to lengthen them.
Voltage drop increases with the increase of current in a circuit and it also increases with heat. Put a maximum current load on a bad wire or connection and it gets hot and drops more voltage across the wire or connection. As it heats up, resistance increases which makes more heat. Round and round you go in a vicious circle until something catches fire or fails.
Voltage drop testing must be done while the usual load is on the circuit. If it is a starter, it has to be tested while cranking the starter. If it is lights, A/C or fan, they must be turned on high while testing. Fail to do this and you will not get accurate results
1.) Most grounds use the negative battery post as their starting point. Keep this in mind when checking grounds.
2.) The voltage will be small if the ground is good: less voltage drop = better connection.
3.) Be sure that the power to the circuit is on, and the circuit is being used in its normal manner. For instance, if it is a light circuit, the lights on that circuit should be powered on.
4.) To measure grounds, place one DVM lead on the battery negative post and the other on the wire or connector that goes to ground.
5.) 5.) Voltage drops should not exceed the following:
200 mV Wire or cable
300 mV Switch
100 mV Ground
0 mV to <50 mV Sensor Connections (sensors are low voltage devices and small drops can have a large effect on the devices dependent on sensor accuracy)
0.0V Connections
A voltage drop lower that spec is always acceptable.
6.)
See http://assets.fluke.com/appnotes/automotive/beatbook.pdf for help for help troubleshooting voltage drops across connections and components. .
The following are diagrams courtesy of Tmoss & Stang&2birds
Convertible top motor wiring
See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring; http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.
TFI module wiring for 94-95 Mustang GT
http://www.veryuseful.com/mustang/tech/engine/images/Mustang-94-95-IgnitionControlModule.gif
Complete computer, actuator & sensor wiring diagram for 94-95 Mustangs
Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
Complete computer, actuator & sensor wiring diagram for 88-90 Mass Air Mustangs
5.0 wiring diagram for Fuel Injectors, Sensors, and Actuators
Main body EFI wiring harness
Ignition switch wiring
O2 sensor wiring harness
Vacuum diagram 89-93 Mustangs
HVAC vacuum diagram
TFI module differences & pin out
Fuse box layout
Mustang 5.0 Lights and Radio schematic, by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxLights-Radio_diag.gif
87-92 power window wiring
93 power window wiring
T5 Cutaway showing T5 internal parts
Visual comparison of the Ford Fuel Injectors, picture by TMoss:
Convertible top motor wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang88VertTopMotorCkt.gif
Engine mounted fuel injector harness
Location of the TPS, IAB, and the 10-pin connectors on a 5.0, picture by TMoss:
Starter circuit
Alternator diagram for 94-95 Mustangs.