High Output Alternator for BMW 6 Series (1985-1989) 3.5L
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High-Amp 145A Alternator for 1985-1989 BMW 6 Series (E24)
What it Does: The High Output Alternator replaces the low-output factory charging unit on the 1985-1989 BMW 6 Series to stabilize operating voltage and supply up to 145 amps for demanding onboard electronics.
The Stock BMW 6 Series Charging Deficit
The original factory Bosch alternator on the E24 chassis delivers an inadequate 65 to 80 amps, struggling to maintain electrical equilibrium under modern operating demands. Heat soak within the engine bay accelerates thermal breakdown in the factory diode trio and internal voltage regulator. This thermal fatigue causes low voltage at idle, instrument cluster dimming, sluggish window regulator operation, and compromised ignition dwell on the M30 powerplant when running auxiliary accessories or electric cooling fans.
The Engineering Solution
Engineered as a direct bolt-in upgrade using the AL49X platform footprint, this unit increases output to a potent 145 amps. It incorporates heavy-gauge copper stator windings, an upgraded heavy-duty rectifier with avalanche diodes, and a solid-state internal regulator to ensure ripple-free DC power from idle to high RPM. The unit includes an external cooling fan and single V-belt pulley, matching factory belt alignment and mounting lugs on the E24 engine block without requiring bracket modifications.
What's Included
- 1 High Output 145-Amp Alternator with V-Belt Pulley and Internal Regulator
Technical Specifications
| Fitment | 1985-1989 BMW 6 Series |
|---|---|
| Engine / Chassis | M30B34, M30B35 / E24 |
| Stock Output | 182-208 hp / 214-225 lb-ft |
| Replaces OEM Part # | 1-1270-01BO, 14813R, 14813N, 12-31-1-711-203, 12-31-1-713-449, 12-31-1-713-450, 12-31-1-714-219, 12-31-1-714-220, 12-31-1-726-602, 12-31-1-726-603, 12-31-1-726-604, 14813, 0 120 469 777, 0 120 469 778, 0 120 469 779, AL49X, 0 986 034 170, 0 986 035 820, 0 986 603 051 |
Compatibility
- 1985-1989 BMW 635CSi 3.5L
Frequently Asked Questions & Fitment Warnings
Does this fit the E24 6 Series?
Yes, this is a direct fit for the 1985-1989 BMW 6 Series equipped with the M30 3.5L engine.
Do I need to upgrade my vehicle wiring?
Installing a dedicated 4-gauge B+ charge wire and upgraded ground strap is recommended to handle peak current and prevent voltage drop across the factory harness.
The BMW Precision Standard
Built to meet exacting German electrical tolerances, this alternator protects sensitive Motronic digital engine management hardware by delivering flat, steady voltage under the heaviest electrical loads.
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