Bronco II 4WD V6-171 2.8L (1985)
2.
If lamp glows, pull fuses, one at a time, and check each circuit for a short. Service wiring harness or components as required.
Indicator Light System Test
Normal Charge Indication - Charge Indicator (Alternator):
With ignition switch OFF - charge indicator (battery symbol) lamp is OFF.
With ignition switch ON (engine not running) - charge indicator (alternator) lamp is ON.
With ignition switch ON (engine running) - charge indicator lamp is OFF.
If the charge indicator lamp does not come on with the ignition ON and the engine not running:
1.
Disconnect the wiring connector from the regulator and connect a jumper wire from the wiring connector I terminal to the battery negative post
cable clamp. Turn the ignition ON with the engine OFF. If the indicator lamp does not light, check the indicator bulb for continuity and replace the
bulb if it is burned out. If the bulb checks good, perform the regulator I Circuit Tests.
2.
If the indicator lamp does not light, remove the jumper wire and reconnect the wiring plug to the regulator. Connect the voltmeter negative lead to
the battery negative post cable clamp and contact the voltmeter positive lead to the regulator A terminal screw. Battery voltage should be
indicated. If battery voltage is not indicated, service the A circuit wiring.
3.
If battery voltage is indicated, clean and tighten the ground connections to the engine, alternator and regulator. Tighten loose regulator mounting
screws to 1.7-2.8 N-m (15-26 in.lbs.).
4.
Turn the ignition ON with engine OFF. If indicator lamp still does not light, replace the regulator.
Ammeter System Test
Normal Charge Indication:
With ignition switch OFF and no electrical load - ammeter should show 0 or center scale.
With ignition switch ON and engine running (fully charged battery) - needle deflects toward charge after starting engine and returns toward center scale
in time. With ignition switch OFF and headlamps ON - ammeter should show a discharge. If ammeter does not register a discharge, check for loose
connections at the ammeter or an open circuit wire prior to replacing gauge.
General Charging System Test
When performing charging system tests with a voltmeter, turn OFF all lamps and electrical components. Place the transmission in Neutral and apply the
parking brake. Test can be performed with Rotunda Starting and Charging Tester 078-00005.
CAUTION: DO NOT MAKE JUMPER WIRE CONNECTIONS EXCEPT AS DIRECTED. TO DO SO MAY DAMAGE REGULATOR. DO NOT
GROUND THE REGULATOR A TERMINAL SCREW HEAD.
Base Voltage Test
1.
With ignition OFF and no electrical load on, connect the negative lead of the voltmeter to the negative battery cable clamp.
2.
Connect the positive lead of the voltmeter to the positive battery cable clamp.
3.
Record the battery voltage reading shown on the voltmeter scale (This is called base voltage).
No Load Test
1.
Connect a tachometer to the engine.
2.
Start the engine and increase speed to approximately 1500 rpm. With no other electrical load (foot off brake pedal and vehicle doors closed), the
voltmeter pointer should move upward (increase) but not more than 2 volts above the base voltage (the first recorded battery voltage). The reading
should be taken when the voltmeter pointer stops rising. It may take a few minutes to reach this point. If the voltage increases the proper amount,
perform the Load Test below. If the voltage increases over 2.0 volts; perform the Over Voltage Tests that follow. If the voltage does not increase,
perform the Under Voltage Tests that follow.
Load Test
1.
With the engine running, turn the heater or air conditioner blower motor ON (high speed) and headlamps ON (high beam).
