You are correct. My 08 FEH AWD is a later model, and the plug to the HV battery heater is missing. However, the internal heater is still there. Last winter I proved it would work by hooking up a 24VDC power supply to the terminals (carefully) with an ammeter in series to check the current pull. The heater pulled about 3A current, which is a nominal 75Watt draw at 24VDC. I intended to make my own harness and external power supply but never got around to it. When connected, you could hear a click, like a relay was being activated to enable the heater.

I can't imagine why Ford removed this harness in 2008 model year? We all know that starting with a warmer HV battery in the winter really helps chaging and EV time.

 

Has anyone found some good prices for these parts? I was quoted the following:
4M6Z*6B018*AA WIRE ASSY - $79.20
F5RZ*6A051*B HEATER ASSY - $40.24
5M6Z*10B689*AA WIRE ASSY - CHARGER HIGH VOLTAGE $129.22

and would probably do it at a more reasonable price.

 

I'm not sure, but I think you don't need the wire assy from the engine compartment to the HV battery (129.22). More than likely this is already installed in the '06 FEH and the wire assy can just plug to it under the hood. The battery wire assy was removed in the some '08 models and newer and I don't know if the battery heater itself was removed from the battery housing. A few people have installed the block heaters here and I don't recall them installing the wire assy back to the battery.

GaryG

 

These are the parts required for option 41H:


I had these parts installed in my 2005 Escape.

 

NAPA shows a 3/4" threaded freeze plug heater w/wire @ $50.
It's output is 450 watts, Anyone know the wattage of the Oem Unit?
Seems alittle less $ condidering it includes the wire.

 

If you’re not interested in the heater in the battery working the NAPA unit should work
just fine. The cord in the Ford OEM assembly also provides a wire to the transformer
unit for the battery heater.

When I put in my OEM heater, transformer, and power cord I measured the resistance of
the heater element. As I recall it measured out at about 30 ohms. This is about right for
450 watts.

 

On Jan 5, Gary G. wrote " The battery wire assy was removed in the some '08 models and newer and I don't know if the battery heater itself was removed from the battery housing." True Statement about the Battery heater harness disappearing. Still don't know why??? My 08 FEH, manufactured in July 2007, does NOT have the Batt harness as Gary reported. However, the battery heater IS still present, at least on the 08' FEH model year. Don't know on the 09 model year? As I previously reported, I temporarily hooked up an external 27VDC supply to the terminals on the battery heater connector, measured current drawn by the circuit, and monitored "TAV" on SGII to verify the battery heater circuit still functioned. I had planned to wire this to the front of the vehicle, connectorize it, and build my own 27VDC supply to accomplish this. It's still on the 'to do' list

 

Thanks,
anyone else interested NAPA
Part Number: BK 6051608
Price Unit 59.49 Each, includes their wiring
I'll pick that up and scavenge the 24v PS
somewhere, although @75W might be hard to find?

 

I purchased the same parts as BillyK listed above and installed it myself in under 1 hour. You need the wire harness as this is the 120vAC power cord you plug in. It has a Y cable split to go to both the block heater and transformer.

The OEM engine block heater runs on 120vAC and is ~400 watts.
The battery heater runs on 24v DC transformer and is 75 watts.

HTH,
-John

 

Anyone know if you use the plug in battery heater, which is 24VDC. or you press the Battery "charge " button it's only 12v? Do they use the same heating element? Why the differnce in voltage?