A repeatedly failed main protective link needs the cause assessed before another replacement is energised. Fitting a stronger link or bypassing it can remove protection from a high-current circuit.
Keep the failure history
Record the correct part identification, when it fails and recent jump-start, charging or starter work. If there was smoke or overheating, stop using the vehicle and arrange appropriate assistance.
A qualified technician should identify the protected circuit and carry out a controlled diagnosis. Do not use repeated replacements as a way of locating the fault. A module repair enquiry should include the event and relevant vehicle-side checks, because internal damage may be a consequence of a broader supply problem rather than the only item requiring attention.
Need help with this fault?
- Relay Clicks but the Controlled Component Does Not Operate
- Electronic Fuse Output Shuts Down Instead of Blowing a Fuse
Browse this collection or prepare a vehicle and module enquiry. Tell us about the vehicle, the fault and any tests already done. Contact our Didcot workshop before travelling or posting a module. Visits are by appointment.