I have a Fly 125. The speedometer and odometer have suddenly stopped working. This might be related to me replacing the headlamp bulb, but I can't be sure. Any help appreciated.

Which insturment cluster does your's have ? electronic instrument cluster or standard instrument cluster !

Standard insturment cluster - speedo / odometer
Speedometer/Odometer
The speedometer and odometer provides speed information based on a speed/distance pulse signal from the vehicle speed sensor (VSS). The VSS is mounted on the speedometer driven gear in the transmission.
Could be the VSS is bad .
Horn The horn system includes the following:

• horn relay
• horn
• clock spring
• steering wheel control switch harness
• steering wheel pad horn switch, which is part of the driver side air bag module. For additional information, refer to Section 501-20B .

The horn is located behind the front bumper mounted to the radiator support.

Is the air bag light lit on the insturment cluster ? If it is the clock spring could be the problem . If not lit check the circuits from the horn relay .

VEHICLE RELAYS Operation Diagnosis .

Which headlamps don't work ? Low beams , high beams , both ?

• The high beams are inoperative

• Bulbs.
• Circuitry.
• Multifunction switch.

• GO to Pinpoint Test C .

• The low beams are inoperative

• Bulbs.
• Circuitry.
• Headlamp switch.
• Multifunction switch.
• LCM.

• GO to Pinpoint Test D .

Principles of Operation
NOTE: Due to varying wattage ratings and resulting current draw, certain aftermarket headlamp bulbs may cause the lighting control module (LCM) to shut down the short circuit protection, resulting in the low beams becoming inoperative. Verify that the headlamp bulbs meet Ford specifications.
Headlamp System The headlamp system consists of:

• two aerodynamic halogen headlamp bulbs and retainers
• headlamp switch
• multifunction switch
• lighting control module (LCM)
• circuit wiring and circuit protection

In normal operation:

• With the multifunction switch in the low beam position, power is supplied by the LCM to the low beam elements through the multifunction switch.
• With the multifunction switch in the high beam position (forward detent), power is supplied to the high beam elements and to the high beam indicator in the instrument cluster.
• When the multifunction switch is pulled toward the steering wheel, the flash-to-pass switch (part of the multifunction switch) is closed and power is supplied to the high beam elements. When the switch is released, they return to low beam operation.
• The battery saver feature of the LCM will automatically turn off the courtesy lamps, demand lamps, headlamps, or parking lamps under the following conditions:
  • The ignition switch is in the OFF position.
  • The headlamp switch is in parking lamps ON or headlamps ON positions.
  • After 10 minutes.

Headlamp Switch The headlamp switch is a multi-position switch.

• The positions include OFF, PARK, and HEAD.
• With the headlamp switch in the PARK position (first detent), a signal is supplied to the LCM which powers the front parking lamps, the tail lamps, the side marker lamps, and the license lamp.
• With the headlamp switch in the HEAD position, power is supplied to the headlamps through the LCM and the multifunction switch.
• The panel dim switch (part of the headlamp switch) is located above the headlamp switch. The panel dim switch operates only with the parking lamps or headlamps on.
• When the panel dim switch is held in the up position, the instrument panel lighting will progressively brighten.
• When the panel dim switch is held in the down position, the instrument panel lighting will progressively dim.

For additional information, refer to Section 413-00 .
Headlamps On Warning Chime If the headlamp switch is left in either the PARK or HEAD position and the driver door is opened, the LCM will sound a headlamps on reminder chime when the following conditions occur:

• The ignition switch is OFF with the ignition key out.
• The driver door is ajar.

For additional information, refer to Section 413-09 .

Inspection and Verification

1. Verify the customer concern by operating the system.

1. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart Mechanical Electrical

• Headlamp switch

• Central junction box (CJB) fuse(s):
  • 6 (15A)
  • 15 (15A)
  • 21 (15A)
  • 23 (15A)
  • 27 (20A)
• Battery junction box (BJB) HI-BEAM HEADLIGHTS (20A) fuse
• Circuitry
• Headlamp bulb
• Lighting control module (LCM)
• Loose or corroded connections

Check your speedometer cable, detach it from the speedometer elevate the front wheel and spin it notice the inner cable if it turns or not, if not replace the cable if it spins then replace the speedometer.

These lights for the dash are controlled by a rheostat instrument control dimmer switch next to the main light switch for the headlights, it is either turned off (have seen this dozens of times) or it is defective. Below is a picture of the switch assembly I speak of. The thumb wheel next to the knob is the dimmer control.

the odometer usually runs off the cable that operates the speedometer, if the speedometer is working there is a problem with the odometer, you may have to replace the speedometer to fix the problem.......hope this helps......cheers

It's probably coincidence, unless the increased system voltage from the new battery was enough to push an old light bulb over the edge.

hi ..
there may be separate relay for these stuffs which you mentioned as not working.check this relay if burnt out replace it and check.
2. check the fuses.weather all in good condition.if not replace and check it.
3.check the wires going to these gadjets.weather damaged.

There are actually two gears that you need to replace, a large one and then smaller one that rides inside it. You can purchase them both at www.fcpgroton.com These can also sometimes affect the operation of your speedometer. Do you by chance have an ABS and TRACS light on? If so the speedometer issue may be related to your ABS controller.

the only thing that is related is the d4/rough gear changing
speed/ rpm malfunction is caused by your speed sensor on the trani (common problem) change it

- the speedometer-cable is broken -that happens after some years all of a sudden
- the problem is: it is not easy to fix because you need to remove the instrument panel to get to the upper connector of the new cable going to the speedometer and to replace the complete cable