What The 8300032 Is
This is a 12-volt gear-reduction starter in the 39MT frame. Eleven-tooth pinion, 6/8 pitch, clockwise rotation, SAE 3 mounting flange. The gear reduction lets a smaller armature spin faster and multiply torque through the reduction gearset, so you get the same cranking effort with less current draw off the batteries and cables.
Polarity is insulated, meaning the ground path runs through a dedicated terminal rather than the mounting flange. The solenoid is sealed for high-cycle service, which matters on a truck that starts and stops twenty times a shift. Our unit is an aftermarket direct replacement built to the same mounting and electrical layout.
Applications listed for this configuration include Cummins L10, N14, M11, ISM and ISX, plus CAT 3406E through C16, Detroit Series 60, Mack E7 and Volvo VED12 — all in 12-volt trim. If the truck runs a 24-volt system or a different mount, this is not your starter.
Why These Numbers Cross
8300032 supersedes and shares its core configuration with a family of Delco Remy 39MT numbers: 8200308, 8200090, 8200091, 8300009, 8300019, 10461318 and 61010754. These differ mainly by build date, solenoid terminal arrangement, or the OE program they were released under, not by the four things that decide fitment — voltage, tooth count, pitch, rotation and mount.
Cummins 3103304 is the same starter released under a Cummins part number for engine-side supply. Engine builders routinely re-number a supplier's unit for their own parts catalog. That is why a tag reading 3103304 and a tag reading 8300032 can come off two trucks with the same cranking hardware bolted to the flywheel housing.
These numbers are listed for identification only. Use them to confirm you are in the right family, then verify against the number stamped on the old starter or your engine serial number. A cross-reference is a starting point, not a fitment guarantee.
Check Before You Order
Pull the old starter and read the tag. Count the pinion teeth — eleven is what this unit carries. Confirm rotation by looking at the drive end: clockwise as viewed from the pinion. Confirm the mount is SAE 3 and that the bolt pattern and nose length match, because a wrong nose depth changes pinion-to-ring-gear engagement.
Before you condemn the starter, load-test the batteries and do a voltage-drop test across both cables and the ground strap. A slow crank with a good starter is usually corroded terminals, a loose ground on the block, or batteries that will not hold under load. Replacing a healthy starter fixes nothing and the new one will crank slow too.
Also inspect the flywheel ring gear through the inspection port. Chewed teeth from repeated grinding will destroy a new pinion in short order. If you find damage, address the ring gear at the same time. Verify your engine serial number before ordering.
8300032 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 8300032. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cummins | 3103304 |
| Delco Remy | 8200308, 8200090, 8200091, 8300009, 8300019, 10461318, 61010754 |
Frequently asked questions
Is 3103304 the same starter as 8300032?
They cross to the same 39MT 12-volt configuration — 11-tooth, 6/8 pitch, CW rotation, SAE 3 mount. 3103304 is the Cummins-side number for the same unit. Confirm the number on your old starter or your engine serial number before ordering, since cross-reference numbers identify the family but do not guarantee fit on your specific truck.
Will this work on a 24-volt truck?
No. This is a 12-volt unit only. Running a 12-volt starter on a 24-volt system will spin it hard, cook the field and armature, and typically take the solenoid contacts with it. Check the system voltage at the batteries and confirm before you order.
My truck cranks slow but the starter tested fine on the bench. What now?
Bench tests do not load the cables. Do a voltage-drop test under crank across the positive cable, the ground strap and both battery posts. Anything over a few tenths of a volt on a leg points at corrosion or a loose connection. Load-test the batteries as a set and individually before replacing the starter.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.