How do Voltage Regulators function in the removal and inspection of the alternator and its components on 2005 Volkswagen Passat?

Disconnect the alternator and the plastic cover. Disassemble the voltage regulator/brush assembly and check the brush length; change, should it be worn. Check the slip rings; clean up small spots, but change the alternator when it is too badly scoured. Install the alternator back and re-examine the charging voltage.

Genuine 2005 Volkswagen Passat Voltage Regulators

Alternator Regulators

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4 Voltage Regulators found

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2005 Volkswagen Passat Voltage Regulator Part Number: 038-903-803-E
$105.01 MSRP: $147.07
You Save: $42.06 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Regulator; Voltage Regulator
- Item Weight: 0.40 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 038-903-803-E
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following 2005 Volkswagen Passat Submodels:
- GL, GL TDI, GLS, GLS 4 Motion, GLS TDI, GLX, GLX 4 Motion, W8 | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 6 Cyl 2.8 L GAS, 8 Cyl 4.0 L GAS
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2005 Volkswagen Passat Voltage Regulator Part Number: 038-903-803-F
$145.18 MSRP: $203.33
You Save: $58.15 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Regulator
- Item Weight: 0.40 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 038-903-803-F
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following 2005 Volkswagen Passat Submodels:
- GL, GLS, GLS 4 Motion | 4 Cyl 1.8 L GAS
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2005 Volkswagen Passat Voltage Regulator Part Number: 078-903-803-D
$166.60 MSRP: $233.33
You Save: $66.73 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Regulator
- Item Weight: 0.40 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 078-903-803-D
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following 2005 Volkswagen Passat Submodels:
- GL, GL TDI, GLS, GLS 4 Motion, GLS TDI, GLX, GLX 4 Motion, W8 | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 6 Cyl 2.8 L GAS, 8 Cyl 4.0 L GAS
View related parts
2005 Volkswagen Passat Voltage Regulator Part Number: 070-903-803-E
$237.99 MSRP: $333.32
You Save: $95.33 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Regulator
- Replaces: 070-903-803-B
- Item Weight: 0.40 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 070-903-803-E
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
More Info
Fits the following 2005 Volkswagen Passat Submodels:
- GL, GLS, GLS 4 Motion, GLX, GLX 4 Motion | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS

2005 Volkswagen Passat Voltage Regulators Parts and Q&A

Q: How do Voltage Regulators function in the removal and inspection of the alternator and its components on 2005 Volkswagen Passat?
A: Disconnect the alternator and the plastic cover. Disassemble the voltage regulator/brush assembly and check the brush length; change, should it be worn. Check the slip rings; clean up small spots, but change the alternator when it is too badly scoured. Install the alternator back and re-examine the charging voltage.