W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
generate a fault code. Do not connect A21 (blue) circuit to ground, as fusible link will burn.
Fig. 3 Alternator output wire resistance test
8.
On 1991-92 Jeep Cherokee, Comanche and Wrangler, connect suitable jumper wire to ground and K20 (green) lead wire at rear of alternator.
This will generate a fault code. Do not connect A142 (green/orange) lead wire to ground.
9.
On all 1992 models except Jeep Cherokee, Comanche and Wrangler, connect suitable jumper wire to ground and K20 (green) lead wire at rear
of alternator. This will generate a fault code. Do not connect A142 (blue) lead wire to ground.
10.
On all models, connect a suitable engine tachometer, then reconnect battery ground cable.
11.
Ensure carbon pile is in OPEN or OFF position, then connect a variable carbon pile rheostat to battery terminals.
12.
Start engine and operate at idle speed, then adjust carbon pile and engine speed to maintain a 20 amp circuit flow. Note voltmeter reading.
Voltmeter reading should not exceed .5 volt.
TESTING RESULTS
1.
If a higher than specified voltage drop is indicated, clean and tighten all connectors in charging circuit. A voltage drop test may be performed at
each connector to locate point of excessive resistance.
2.
If charging circuit resistance test was satisfactory, disconnect battery ground cable, then the ammeter, voltmeter, carbon pile and tachometer.
3.
Remove jumper wire.
4.
Connect battery ground cable, then the hose between Engine Controller and air cleaner.
5.
On models quipped with on board diagnostics, erase codes using DRBII test tool or equivalent.
Current Output Test
On models equipped with airbags, before attempting to diagnose or service components, disconnect and isolate battery ground cable, then
wait at least 10 minutes prior to beginning service. Failure to do so may result in accidental deployment or possible personal injury.
TESTING
1.
Disconnect battery ground cable.
2.
Disconnect "B+" lead at alternator output terminal.
