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DENSO R5 Starter Installation Guide
Starting Motor Overcrank Protection (OCP) Circuit Bypass
(if equipped)
The OCP circuit is an option used on many trucks. It utilizes a thermal switch to open
the starter relay ground circuit when excessive starter temperatures are reached due to
prolonged cranking of the starter motor. This is commonly called over-cranking.
The information below describes the procedure to bypass the OCP circuit when
replacing an OCP equipped starter with a DENSO R5 starter.
The presence of OCP can be identified by looking at the original starter (commutator
end view). The OCP terminal comes out of the main wire harness and is plugged into
the thermal switch at the rear of the starter. The DENSO R5 kW starter does not require
or have an external OCP device. However, it is necessary to complete the relay ground
circuit when installing an R5 kW in a vehicle originally equipped with this OCP device.
This can be accomplished by installing a jumper plug into the OCP wiring harness
connector.
• DENSO OCP Jumper Plug Part #053680-8010
Wiring Assembly