VOLTAGE REGULATOR FAILURE NO OR FULL CHARGE CONDITION

1986-87 BONNEVILLE, GRAND PRIX, AND FIREBIRD MODELS

Please discard bulletin 87-6(Gasoline)-16, dated 1/87, due to updated information contained in this revision."

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 12ST 1105675 1101307 94 12SI 1105654 1101308

LD5 86 B,G/ 56 12ST 1100239 1101307 87 G 78 12SI 1100200 1101307 70 15SI 1105197 1101322 85 15SI 1105548 1101323

LB4 86B/ 56 12SI 1105673 1101307 87 G 66 12SI 1105674 1101307 78 12SI 1105650 1101307 94 12SI 1105651 1101308

LBB 86F/ 66 12SI 1105600 1101307 87 F 78 12SI 1105588 1101307 97 17SI 1105587 1101306

LB9 86 F/ 108 17SI 1101224 1101306 87F

SERVICE DEPARTMENT PONTIAC DIVISION GENERAL MOTORS CORPORATION

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.