Is there a significance in the bottom number of this relay?


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Th1s_0ld_Truck

5+ Year Member

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Joined
Oct 10, 2021
Messages
18
Points
601
City
Louisville
State - Country
KY - USA
Vehicle Year
1999
Vehicle
Ford Ranger
Drive
2WD
Engine
3.0L
Transmission
Automatic
I have a 1999 Ford Ranger 3.0L XLT with a drain or short somewhere in the PCM circuit. I determined this by using a test light and pulling fuses. Once found, I pulled this relay from the PCM power port for testing but apparently there are A types and B types which determine the location of the terminals. It would help to know the difference when testing with a meter. There are two other FOAB 4B192-AA relays in the box, one for the starter and one for the blower motor, but the bottom number varies by a digit. Once labeled, I would like to know if I can swap the blower motor with the I have pulled to see if it solves the problem.
Is there a significance in the bottom number of this relay?
 

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