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- Switch on the head lamps for 5 minutes.
- Keeping the head lamps ON, start the engine. If the lights die,
- Check the battery terminals.
- Check battery state of charge.
- Charging system. If the lights still glow sharply,
- Check fuses and relays in under the hood fuse and relay box junction.
- Battery to starter motor cable.
- Battery to engine ground and chassis ground cable.
- Solenoid on starter motor.
- Starter motor.
with engine control switch ON and engine running at amoderate speed, charge indicator lamp should be off, if lamp is not off, detach wiring harness at generator. iflamp goes off generator is faulty. if lamps stay on, check for grounded "L" terminal in wire harnes
Hi, have you checked to see if the eye level brake light is working, other than that check the wiring harness for the boot/tail gate within the rubber corrugated trunking on the right hand side near the boot hinge as it is quite common for the wires to break wear they always flex and check the multiplug on the back of the rear light unit as the earth terminal may have burned out, hope this helps, regards mark.
The P0420 that you are getting may be an inoperative air/fuel sensor (the actual code is "catalyst system efficiency below threshold". This code will not affect the head/tail lamps or dash lights.
You may have a bad headlamp switch.