Aftermarket Alternator Insulator 42-82335

The Aftermarket Alternator Insulator 42-82335 is a new aftermarket replacement insulation component designed for specified Nippondenso IR/IF alternators. Measuring 12.6 mm inside diameter, 25.7 mm outside diameter, and 17 mm overall length, it provides proper electrical isolation for the alternator output terminal while maintaining correct terminal alignment during alternator rebuilding and repair.

Product Specifications

Product Type: Alternator Insulator

Condition: New Aftermarket Replacement Part

Fits: Specified Nippondenso IR/IF Alternators

Dimensions: 12.6 mm ID × 25.7 mm OD × 17 mm Overall Length

Cross References

OEM: 021605-3090, 27387-0F060, 27387-20130

Aftermarket: 42-82335

Compatible Lester Numbers

11032, 11033, 11034, 11036, 11037, 11038, 11044, 11046, 11084, 11087, 11088, 11090, 11136, 11137, 11138, 11139, 11146, 11153, 11195, 11196, 11198, 11201, 11204, 11237, 11238, 11248, 11250, 11293, 11322, 11323, 11324, 11325, 11326, 11350, 11351, 11352, 11369, 11384, 11385, 11386, 11400, 11401, 11402, 11403, 11404, 11407, 11408, 11429, 11430, 11431, 11476, 11507, 11513, 11516, 11517, 11519, 11521, 11522, 11570, 11577, 11621, 11622, 11623, 11625, 11628, 11758, 11765, 11766, 11773, 11774, 11787, 13905, 13927, 13963, 13978, 13981, 13983, 13984, 13994, 14021, 14072, 14486, 14487, 23298

Compatibility & Fitment

This alternator insulator is designed for specified Nippondenso IR/IF alternators.

Always compare the original component before ordering. Verify the part number, dimensions, shoulder profile, outside diameter, overall length, and installation orientation using the OEM and Lester references whenever possible.

Vehicle year, make, and model alone may not identify the correct internal alternator component, as manufacturers often used multiple alternator designs during the same production year.

Features & Benefits

• Precision aftermarket replacement part
• Maintains proper electrical isolation of the charging terminal
• Supports correct output terminal alignment
• Manufactured to match original dimensions
• Ideal for alternator rebuilding and repair
• Cross-referenced to OEM and aftermarket part numbers

What Does an Alternator Insulator Do?

The alternator insulator electrically separates the charging terminal from the alternator housing, preventing unintended electrical contact while supporting the output stud and insulating hardware. Proper insulation is essential for safe and reliable charging system operation.

Years of engine heat, vibration, moisture, and repeated tightening of terminal hardware can cause the original insulator to become brittle, cracked, or damaged. Replacing worn insulation during a rebuild helps restore proper electrical isolation and long-term charging system reliability.

Common Signs Replacement Is Needed

Replace the alternator insulator if you notice:

• Cracked or broken insulation
• Heat damage or discoloration
• Loose or unsupported output terminal hardware
• Missing insulating sleeve
• Electrical arcing around the charging terminal
• Damage discovered during alternator rebuilding

Installation Recommendations

Installation should be performed by a qualified technician or experienced alternator rebuilder. Install the replacement insulator in the same orientation as the original component without trimming or modifying the part. After reassembly, verify that the charging terminal remains electrically isolated from the alternator housing and bench-test the alternator whenever possible.

While You're Rebuilding

Inspect other common wear components to help maximize charging system reliability:

• Bearings

• Brushes

• Brush Holder

• Slip Rings

• Voltage Regulator

• Rectifier

• Diodes

• Rotor

• Stator

Why Buy From RC Auto Electric?

RC Auto Electric specializes in alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.

Disclaimer

Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original part, dimensions, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.