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7.4.3 - Overdrive Reverse Lockout Information ( Pual Saltwick,  April 23, 2003 )

There is no relay or reverse lock-out on the factory 420/S OD wiring.
The solenoid on the gearbox gets its power from the same source as
the reverse switch (before contacts), but it is irrelevant to the circuit.
The power goes from the reverse light switch terminal, through the 4th
gear switch (if closed by being in 4th gear), through an in-line fuse,
through the column mounted OD switch, and onto the solenoid.
It would have been easy for the factory to wire a relay through the reverse
switch, but they chose to just print a warning "Don't reverse with the OD
engaged " in the manual. Make sure you put an in-line fuse between the 4th
gear switch and the column ("ON") switch, the solenoid is a two coil device
that can draw 20 amps when it fails.


 

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