Generators & Regulators: Other Land Rover Discovery II

DRIVE BELT TENSION

A serpentine drive belt is used to drive all accessaries. Accessory drive belt tension is controlled by a belt tensioner. Check accessory drive belt for signs of splits, fraying, oil contamination and wear. Replace as necessary.

PRELIMINARY CHARGING SYSTEM CHECK

Ensure battery is in good condition and has a circuit voltage of at least 12.3-12.6 volts. Ensure battery connections are clean and tight. Ensure battery charging area is well ventilated and that there are no open flames or sparks. Check condition of accessory drive belt. Ensure generator connections are clean and tight. Check for parasitic drain on battery.

Discovery

1. Connect carbon pile rheostat according to manufacturer's instructions. Turn off all accessories. Start engine and run at 3000 RPM. Rotate carbon pile load control until greatest amperage output (minus 10 percent for EFI and ignition loss) is obtained without allowing voltage to drop below 12 volts.
2. Ensure engine is still running at 3000 RPM. Switch selector to regulator test and read voltmeter. Reading should be 13.6-14.4 volts. Switch selector to diode/stator test. Turn on headlights. With engine still running at 3000 RPM, read voltmeter. Reading must be in the "OK" range.

1. Connect voltmeter between generator terminal B+ and positive battery terminal. (Scheme 3) Turn on headlights. Start engine. Raise engine speed to 3000 RPM and read voltmeter. Reading should be 0.5 volt or less. If voltage is as specified, go to next step. If voltage is not as specified, locate and repair high resistance in charging system circuit.
2. Move voltmeter leads to frame of generator and negative battery terminal. With engine speed at 3000 RPM, read voltmeter. Reading should be 0.25 volt or less. If voltage is as specified, charging system is okay. If voltage is not as specified, locate and repair high resistance in charging system circuit.

Scheme 3

CHARGE WARNING INDICATOR REMAINS LIT WITH ENGINE RUNNING; GENERATOR FUNCTIONS NORMALLY

Note. Discovery and Discovery Series II testing information is not available from manufacturer.

Range Rover

1. Disconnect Body Electrical Control Module (BECM) Green 20-pin connector (C1289). BECM is located under right front seat. Turn ignition switch to RUN position. Measure voltage between ground and harness connector C1289 terminal No. 15 (Brown/Yellow wire). See «WIRING DIAGRAMS»(ref-2807-S06277196642000041300000). (Scheme 4)
2. If battery voltage exists, Check BECM. Check instrument cluster. See INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Repair as necessary. If battery voltage does not exist, repair Brown/Yellow wire between BECM and generator.

Scheme 4