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Specifications
SPECS:24 Volt, 4-Terminal
SPECS FOR:Delco 28MT Series OSGR Starters
DIM 1:Batt. Term. M10 x 1.5
DIM 2:Motor Term. M8 x 1.25
DIM 3:Switch Term. M5 x 0.8 Post (LH)
DIM 4:Relay Term. M5 x 0.8 Post (RH)
NOTE 1:With relay terminal.
NOTE 2:*Replaces Delco 10457115 solenoid w/ dummy terminal.
Voltage
24
LESTER NUMBERS
6591, 6592, 6596, 6597, 6901
Replaces
Delco 10457115, 10457152
UNIT NUMBERS
Case 76193688; Cummins 3675207RX; Delco 10461444, 10461459, 10461464, 10461465, 10461472, 10465405, 10479600, 10479608, 10479616, 10479629, 10479647, 1113272, 1113294; John Deere RE52120, TY24303; Letrika (Iskra) Tech. AZF4106; New Holland 76193688; Nikko 0-23000-2370, 0-23000-2371, 0-23000-2372, 0-23000-2373, 0-23000-2374; Prestolite 860318
Aftermarket Starter Solenoid 66-8407 Product Overview
Aftermarket Starter Solenoid 66-8407 is an aftermarket solenoid intended for compatible starter repair, rebuilding, and maintenance applications. It is designed for professional rebuilders, technicians, repair shops, and customers who need a dependable replacement for a worn, damaged, corroded, or missing component. Before ordering, confirm the product name, part number 66-8407, measurements, mounting style, connector configuration, original equipment references, and application information.
Product Specifications and Application Details
The original listing provides these product-specific details: Specifications SPECS:24 Volt, 4-Terminal SPECS FOR:Delco 28MT Series OSGR Starters DIM 1:Batt. Term. M10 x 1.5 DIM 2:Motor Term. M8 x 1.25 DIM 3:Switch Term. M5 x 0.8 Post (LH) DIM 4:Relay Term. M5 x 0.8 Post (RH) NOTE 1:With relay terminal. NOTE 2:*Replaces Delco 10457115 solenoid w/ dummy terminal. Voltage 24 LESTER NUMBERS 6591, 6592, 6596, 6597, 6901 Replaces Delco 10457115, 10457152 UNIT NUMBERS Case 76193688; Cummins 3675207RX; Delco 10461444, 10461459, 10461464, 10461465, 10461472, 10465405, 10479600, 10479608, 10479616, 10479629, 10479647, 1113272, 1113294; John Deere RE52120, TY24303; Letrika (Iskra) Tech. AZF4106; New Holland 76193688; Nikko 0-23000-2370, 0-23000-2371, 0-23000-2372, 0-23000-2373, 0-23000-2374; Prestolite 860318. Use this information together with the product photographs, dimensions, cross-reference numbers, and application notes when confirming the correct replacement.
Key Features and Benefits
- Product-specific aftermarket replacement for compatible starter applications
- Part-number-focused identification for easier comparison and ordering
- Suitable for professional repair, rebuilding, inspection, and maintenance work
- Designed to support dependable fit, operation, and long-term service performance
- Useful for matching original equipment numbers and common cross-reference numbers
Compatibility and Fitment Guidance
Fitment can vary by vehicle model, starter or alternator design, production date, manufacturer, connector style, mounting configuration, and original equipment number. Compare the listed part number, product photos, dimensions, Lester numbers, unit numbers, and replacement references with the original component. Contact RCAutoElectric when additional compatibility confirmation is required.
Professional Installation Notes
Inspect the complete assembly and related components before installation. Professional installation or rebuilding service is recommended whenever specialized tools, electrical testing, soldering, pressing, torque specifications, or technical adjustments are required.
Explore Related RCAutoElectric Categories
Starters | Starter Parts | Starter Rebuild Kits | Alternators | Alternator Parts | Alternator Rebuild Kits
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Frequently Asked Questions
How do I confirm this part is compatible? +
Compare 66-8407, dimensions, cross-reference numbers, mounting details, application notes, and product images with the original component before ordering.
Is this an OEM part or an aftermarket replacement? +
This listing is for an aftermarket solenoid unless the original title or description specifically states that the item is OEM.
What should I verify before ordering? +
Check the original equipment number, unit number, measurements, connector style, mounting design, rotation or polarity when applicable, and all fitment details in the listing.
Is professional installation recommended? +
Professional installation or rebuilding service is recommended when the job requires special tools, electrical testing, soldering, pressing, torque settings, or technical adjustments.
Where can I find related repair parts? +
Use the internal links in the SEO section to browse related starters, starter parts, starter rebuild kits, alternators, alternator parts, and alternator rebuild kits.