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Replacing the SD85 with the S500-A60: An Alternative Solution

Written by
The MurCal Blogster
Published on
March 1, 2024 at 10:06:31 AM PST March 1, 2024 at 10:06:31 AM PSTst, March 1, 2024 at 10:06:31 AM PST

Murphy’s SD85 Solenoid Power Drive Time Delay was recently discontinued.  


But with a little engineering, the experts at MurCal were able to help our customers with a replacement.


The Trombetta’s S500-A60!


Here’s some instructions and images to make the transition as smooth as possible:


To replace an SD85 with the S500-A60, you'd wire the following way:


Terminal 1 on the SD85 is dual purpose. It wires to Battery - (Ground) and to the Ground terminal on the solenoid. With the S500-A60, there are separate terminals.

Terminal 2 on the SD85 is equivalent to the RED (Hold) terminal on the S500-A60. This is the low current output that stays on the entire time that the solenoid is pulled in.

Terminal 3 on the SD85 is equivalent to the AUX (+) "ON OR RUN SWITCH" terminal on the S500-A60. This is what tells it to pull in the solenoid.

Terminal 4 on the SD85 is equivalent to the WHITE (Pull) terminal on the S500-A60. This is the high current momentary output from the module that pulls the solenoid in.

Terminal 5 on the SD85 is equivalent to the BAT + terminal on the S500-A60. This is powered all the time.



See the Trombetta's S500-A60 in the store -->


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For Technical Support, Please Call Us At 661-272-4700, Contact Us Or Email Us At Sales@Murcal.Com

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