Firebird V8-305 5.0L VIN F FI (1987)
Voltage Regulator: All Technical Service Bulletins
Voltage Regulators - Undercharging/Overcharging
Number 87-6 (Gasoline)-16A Date 4/87
Subject:
INOPERATIVE VOLTAGE REGULATORS
1986-87 BONNEVILLE, GRAND PRIX, AND FIREBIRD MODELS
CONDITION:
Under certain operating conditions, the voltage regulator may become inoperative causing either a no-charge or full-charge condition. A no-charge can
lead to a no-start condition, while a full-charge can lead to excessive battery charging, which can damage the battery.
CORRECTION:
An improved voltage regulator, P/N 1116423, has been released. Replace the original regulator with the new regulator. The new regulator can be used
for any 1986 Bonneville, Firebird or Grand Prix or 1987 Safari Wagon or Grand Prix models.
If the entire generator must be replaced, use the table on the following page for correct part numbers.
WARRANTY INFORMATION:
Use existing Labor operations.
Engine
Usage
Rating
Series
Original P/N
Service P/N
LG4
86 B,G/
56
12SI
1105676
1101307
87 G,F
78
12SI
1105652
1101307
66
12SI
1105675
1101307
94
12SI
1105654
1101308
LD5
86 B,G/
56
12SI
1100239
1101307
87 G
78
12SI
1100200
1101307
70
15SI
1105197
1101322
85
15SI
1105548
1101323
LB4
86 B/
56
12SI
1105673
1101307
87 G
66
12SI
1105674
1101307
78
12SI
1105650
1101307
94
12SI
1105651
1101308
LB8
86 F/
66
12SI
1105600
1101307
87 F
78
12SI
1105588
1101307
97
17SI
1105587
1101306
LB9
86 F/
108
17SI
1101224
1101306
87 F
