there is an new alternator design for the 3.5L :P/N 10464469
for cars with the air pump there are 180 amp alternators available.
from AlldataDIY:
2000 Oldsmobile Intrigue V6-214 3.5L VIN H SFI
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. . . . . Headlamps/Interior Lamps - Dim Intermittently
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Notes
Headlamps/Interior Lamps - Dim Intermittently
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-03-001A
Date: April, 2002
TECHNICAL
Subject:
Headlamps/Interior Lights Dim Intermittently in Cold Weather
(Replace Generator)
Models:
1999-2002 Oldsmobile Intrigue with 3.5L V6 Engine
(VIN H - RPO LX5)
This bulletin is being revised to add VIN breakpoints and to include information on 2001-2002 vehicles which may exhibit a similar condition. Please discard Corporate Bulletin Number 01-06-03-001 (Section 06 - Engine/Propulsion System.
Condition
Important: Short term voltage drops (flickers/fluctuations of lights) may occur whenever high demands are placed on the vehicle's electrical system. This is considered a normal generator output characteristic and a repair may not be necessary. Some owners of the 1999-2001 model year Oldsmobile Intrigue built prior to VIN breakpoints 1F237068 may comment on an intermittent condition where the headlamps or interior lights may dim intermittently. This condition may also be noted in the blower speed slowing or changing pitch intermittently. Some 2001-2002 model year vehicles built after the VIN breakpoints may exhibit a similar condition.
Cause
On 1999-2001 vehicles built before the VIN breakpoints, this condition may be caused by intermittent low voltage. Transient engine vibrations may induce the generator to experience field discontinuity. This state results in a voltage spike that causes the voltage regulator to reset. During this period, the electrical system drops to battery voltage.
On 2001-2002 vehicles built after the VIN breakpoints, the voltage drop may be due to the electric AIR (Air Injector Reactor) pump cycling. This electric pump causes a large current draw when it starts.
Important: At no time during the above conditions will the headlamps go out.
Correction
On 1999-2001 vehicles built before the VIN breakpoints, replace the generator with a revised generator, P/N 10464469, that has circuitry to inhibit the voltage regulator reset condition. Use the procedure below to replace the generator.
On 2001-2002 models built after the VIN breakpoints, do not attempt any repair to the vehicle. This is a normal condition of the vehicle and does not indicate the need for service. If the customer requires reassurance that this is a normal condition, please refer to the AIR pump demonstration section below.
Important: 2000 model year California and Northeast states emission equipped vehicles and all 2001 Intrigues are equipped with the electric AIR pump. After generator replacement, these vehicles may still exhibit very short dips and/or headlamp dimming due to the AIR pump cycling. Refer to DTC P0410 in the Engine Controls sub-section. If the generator has been replaced, any short term headlamp dip should be considered normal. If the customer returns a vehicle that has been corrected with a generator replacement, you may reassure the customer by demonstrating the condition. Refer to the AIR pump demonstration section.