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The cord on my block heater is frayed at the plug end and no longer works. I bought a new three prong plug to wire in but dont know which wire goes where. I thought I'd ask before going ahead and shorting out the heater in my truck.
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2001 F350 XLT Extended Cab 4x4 7.3 L Diesel
I believe it's center ground and the two outside wires don't matter. It's A/C. Test for ground if you have a multimeter and that should get you your answer.
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Semper Fi!
'07 Expedition Eddie Bauer 4x4
'69 Camaro SS396 X66
'05 F350 SC 6.0 PSD, Fisher MM2, 2.5" Leveling Lift, harpooned tank (Sorely missed...)
Doesn't the block heater only have two contacts? If that is the case, no ground to worry about and A/C isn't polerized. Just put either of the two hot wires (white/black) on the plug.
If there is a ground go as the above post.
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BPofMD - Bud - USN-Actively Retired
Maryland Chapter Plankowner
2005 F250 PSD 4X4 LB Crew-cab Arizona Beige / Blue Spring / Gauges / Coolant Filter / SG-II / Peragon Bed Cover/ P/S Filter/ MAG-HYTEC differential cover/
2007 Arctic Fox 30' Fifth Wheel -2012 VW Passat SE TDI (An ALL-DIESEL family) Join the Maryland Chapter click HERE
There is three wires on mine so i guess the middle one is ground. Also, does anyone have that mod for the heater plug that you put into the side of the driverside bumper??
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2001 F350 XLT Extended Cab 4x4 7.3 L Diesel
Click on my screen name above and go to my gallery.
Scroll down to the gallery with the block heater plug mod.
Good luck... great mod...
Lol, good thing I didnt do that last year. I was pulling a 15,000 pound tank and found out the plastic piece under the bumper ripped off going through some mud and dirt. Found out it was dragging for about 100 km. Ripped it off and left it in the ditch.
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2001 F350 XLT Extended Cab 4x4 7.3 L Diesel
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Join the Maryland Chapter click 
Try this . . .
HOOH!
