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How do I know which one is positive and which is ground for the wire coming out underneath by the air intake? There is no markings?


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I have no idea what the other end of the harness looks like, but;

If you have a multimeter & can access the other end, & you know the +/- on the other end, then a simple conductivity test can identify the unknown ends in your photo.

 

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Can you pull back the covering to assess the colors of the wires?

You may find helpful info in the description of our gas Webasto install on my blog.

msnomersvan.wordpress.com
 

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2019 3500 extended, white. Stella.
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How do I know which one is positive and which is ground for the wire coming out underneath by the air intake? There is no markings?


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I believe you are holding the wires for the fuel pump which I don't think it matters.. + or -.
Check out the Blog on the heater thats at vanlifeoutfitters.com I found it very helpful. How To Install a Webasto Gasoline Heater In Camper Van
 
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