Sprinter Adventure Van Build – Heater Install Part 2 (High Altitude Kit)

After experiencing some issues with our Espar /Eberspaecher D2 sprinter heater when camping in the cold at high altitude (aka, the time you really want your heater to work), we decided to add the high altitude kit to our Espar heater. Like the heater itself, we ordered it from HeatSo.com. And again shipping was fast and the price was good.

The altitude kit is really pretty simple. Its just a little box that you insert in-between the heater wiring and your heater controller (in our case, the EasyStart Timer). So it goes like this…

Original Wiring/Device Order:

Heater Wiring –> <10 pin connector> <– EasyStart Timer Controller

New Wiring/Device Order:

Heater Wiring –> <4 pin connector> <– High Altitude Sensor –> <10 pin connector> <– EasyStart Timer Controller

10-pin male connector required in order to connect to the EasyStart Timer (comes with the install kit). Wired with red, blue-white and brown wires.

Wiring the high altitude kit is also pretty easy, presuming you are doing it this way for the first time. IF you are like us and retrofitting the high altitude kit, it is a much bigger pain (read: just get the high altitude kit the first time and avoid this problem). The issue is with the connectors, they are pretty easy to assembly, crimping the wires into the pins and then sliding the pins into the plastic housing. The problem is, you cant get those pins out again. Like really, not possible – I tried for about an hour and ended up destroying the plastic housing / harness. Fortunately, if you are reading this and going through this nightmare, I have already figured it out for you. You just need to order a new molex type connector and pins. I got mine from Digikey for under $10 (but requiring about 2 hours of research to find the right part). The part numbers are WM4772-ND for the connector and WM3112CT-ND for the pins. Once you have those parts its easy. Just cut off the old connector and wire in the new one on the other side of the High Altitude Sensor.

Note: I had the yellow wire connected through the high altitude sensor initially, this appears to be incorrect. The heater was working, but I was getting occasional ‘no signal’ errors. Will report back once this new wiring has been tested out more significantly. However, per the wiring diagram to the right, DO NOT CONNECT THE YELLOW WIRE.

High Altitude sensor wired up. The 4-pin connector came pre-wired. The 10-pin connector has to be wired up with the red, blue-white and brown wires as shown.
The male side of the 4-pin connector (that comes with the high altitude kit) mut be wired to red, blue-white and brown, as shown. Note: gray-red and brown-white wires are still wired together, per original heater post.
Showing (from left to right): Heater Wiring (disappearing into dash); 4 pin connectors; High Altitude Sensor Module; 10 pin connectors; EasyStart Timer Controller (not shown)
Showing (from left to right): Heater Wiring; 4 pin connectors; High Altitude Sensor Module; 10 pin connectors; EasyStart Timer Controller

5 thoughts on “Sprinter Adventure Van Build – Heater Install Part 2 (High Altitude Kit)

  • March 22, 2017 at 3:28 pm
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    Thanks for the details on connector parts. I couldn’t believe that Heatso didn’t include an extra connector or two in the complete install kit for my D2 heater. I mangled one on the dosing pump wiring and had to solder it. Spent an afternoon driving around trying to find same connector. I didn’t buy high altitude kit from start and going to add it now. Glad I found your blog.

    Reply
  • March 20, 2017 at 11:51 am
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    It looks like you have the Easy Start Timer fitted to a faceplate that will sit in that little cubby (sunglass holder) space above the map light between the driver and passenger visors. Where did you get the matching gray plastic face plate?

    I have a 2016 Sprinter 144 4×4 to compare. Thanks for these tips!! We ordered the High Altitude sensor right out of the gate because of your recommendation.

    Reply
    • March 21, 2017 at 11:34 am
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      Patty – awesome! We’ll have to compare notes on how everything works. The “faceplate” came with our van. I believe the compartment we put our altitude sensor in was for a CB radio (has power in there too) and the faceplate cover is removable. Not sure where you could get it, or something like it. Looking into it a bit more, it appears this is part of the FF8 Option “Storage Slot at Front U/ Roof Liner”. But if yours didn’t come with that, you might be able to cut something out of plastic or wood that works the same?

      Reply
  • February 28, 2017 at 12:25 pm
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    Sorry you had to go through all that! But thank you for sharing the connector type and confirming that I made the right decision by getting the high altitude kit with my initial purchase.

    Reply
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