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Old 06-26-2020, 10:03 PM   #1
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Default Control Max thruster equalizer failure

I'm new to this forum so please bear with me! I have a 2001 2300SC with the Control Max thruster docking system installed. The 'equalizer' which converts 12V to 36V has failed. Mercury Marine part 883105. Does anyone know where I might find a replacement since these are no longer available from Mercury? Or any guesses on the specs of this unit in terms of 36v output and function? I have found a device at ATO.COM (https://www.ato.com/dc-dc-boost-converter-12v-to-36v) that looks similar but I'm unsure what output, amps and watts, are appropriate. Thanks in advance for any guesses or advice!
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Old 07-01-2020, 02:04 PM   #2
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I would think any 12VDC -> 36VDC (DC/DC) Converter/Regulator would work. The battery is sending 12VDC, the thruster is pulling 36VDC. How it gets converted from one to the other is of no consequence to the bow thruster.
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Old 07-01-2020, 03:40 PM   #3
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Is the old part labeled for power output (Watts)? If not what is the motor rated at? This will help you size the new DC/DC converter.
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Old 07-02-2020, 03:57 PM   #4
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Thanks for the comments. Unfortunately neither the equalizer or the thruster motors are labeled with any sort of power specs. I contacted Mercury Marine customer service for that sort of information and they supplied the following table:
MIN TYP MAX UNIT NOTES
INPUT VOLTAGE 9 14.7 16 V

INPUT UNDERVOLTAGE
LOCKOUT (TURN ON) -- 13.1 13.1 V

INPUT UNDERVOLTAGE
LOCKOUT (TURN OFF) 12.6 12.8 -- V

OUTPUT UNDERVOLTAGE
LOCKOUT -- 28 -- V OUTPUT BATTERY BANK
MUST BE PRESENT AND
ABOVE 28V FOR EQUAL-
IZER TO TURN ON

INPUT CURRENT -- 34 37 A @lout = 10A

QUIESCENT/PARASITIC
CURRENT -- 3.5 7 mA Vin <= 12.4V

OUTPUT VOLTAGE Vin X 3 V

I'm not familiar enough with some of these parameters to know if the Mercury equalizer simply supplies 36V current or if it also has some built in intelligence to know when to turn itself on and off so the ship's 12V battery doesn't deplete itself unnecessarily.

Any other thoughts are most appreciated. Thanks to all once again.
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Old 10-23-2020, 07:51 AM   #5
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If I'm not mistaken, you should have a bank of 3 12-volt batteries wired in series to produce 36 volts. The equalizer converts the 12 volts in your engine battery/ies to 36 volts. There are a couple of fuses in the circuit; have you checked them?
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