Bobcat · Electrical

Bobcat code M4803: Front light relay error OFF

What it means

The controller turned the front light relay on but doesn't see its output on, so the front lights may not work.

Can I keep running?

Keep going carefully, fix soon

Usually, if the machine runs normally: finish the job carefully and fix it soon. Stop if the machine derates, overheats, loses power or the code comes with an alarm.

Check first

Park on level ground, lower the lift arms and attachment to the ground, stop the engine and remove the key.
Check the fuses and relays for that circuit using the fuse decal or the O&M manual.
Make sure the light relay is fully seated.
Inspect the front light wiring for damage.
Restart and see if the code comes back. If it does, stop and call your Bobcat dealer.

Likely causes

Blown light fuse
Failed or loose light relay
Short or broken wire in the light circuit

The fix

A fuse, relay or wiring repair is the usual fix. If the fuse keeps blowing, look for a short or call your dealer.

Different code on your screen? Snap the display and Mechy reads it.

Questions

What does Bobcat code M4803 mean?

Front light relay error OFF. The controller turned the front light relay on but doesn't see its output on, so the front lights may not work.

Can I keep running with M4803?

Usually, if the machine runs normally: finish the job carefully and fix it soon. Stop if the machine derates, overheats, loses power or the code comes with an alarm.

How do I fix Bobcat code M4803?

A fuse, relay or wiring repair is the usual fix. If the fuse keeps blowing, look for a short or call your dealer.

Sources

Code meanings vary by model, serial range and software. Confirm with your operator's manual or Bobcat dealer before replacing parts.

Snap the display and Mechy reads the code

Take a photo of the screen and the machine, say what it is doing, and get the checks and the fix as steps with moving drawings.

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