Marinette Boat Forum

Replacing bilge blower. 73, 32ft sedan FB. Wire colors are white and green. Which one is positive? Which one is negative? New blower motor is wired with black and yellow. I know I can start following wires to find out. Was hoping someone knows the answer to save me some crawling around. Thanks for any info.

Easiest way is to test the wires with a meter. One wire should go to ground; the other should rad open (with the switch off).

Jeff

White is ground 12v on my 75 Marinette.
bill

Easy check...
--> with your green and white wires NOT connected to the blower (hanging free and NOT touching anything!!)...

- use a volt meter set to 12v DC. Red lead plugged into correct connection. Black lead plugged into Common connection.
- touch/connect meters leads to yellow and white wires simultaneously (ex - meter black lead to green wire & red meter lead to yellow wire)
- If reading shows a " - " sign on the display, you have the meter's leads reversed. Change them around. This display (prior to changing them around) is negative voltage. No harm, no foul. Negative voltage is used in the Telecomm industry. You need positive voltage for your boat's 12v system.
- reading should now have NO " - " in front of the reading's number display. This is positive voltage and what you're looking for.
--> Note which wire the RED lead from your meter goes to which wire providing voltage to the blower.
- the blower's manual should show which wires " + " (positive) and which is " - " negative.