Thetford parts reference
Thetford 618407
Wiring Harness-IM
618407 is the Thetford part number for the wiring harness-im. It is printed in Thetford’s own parts documentation, which we hold a copy of and link below.
Thetford says to use 639086 instead
Thetford marks this number with “USE 639086” on its own parts list, which is the manufacturer telling you 639086 is what to order now. That instruction comes from the document, not from us, and not from what sellers happen to call the part.
Current number: 639086
Which parts lists carry this number
It appears on the parts lists for 4 different models: 1200 Series, 1210 Series, N1095 Series and N64/N84 Series. A number shared across several models usually means the component was carried over between them, which is useful when the exact list for your model is not the one you can find.
Availability
Thetford marks this number with an asterisk, and the legend on that document reads “LIMITED AVAILABILITY”. It is still a live number, but supply is constrained, so it is worth checking secondary sources rather than assuming it is freely stocked.
Where this comes from
- Document
- PL_629700_1200_022025.pdf
- Published by
- Thetford
- Retrieved
- 2026-08-28
- File checksum (SHA-1)
55e15e16179f868835f72a4f2fce72d7a0ad8c6c
What we have not checked
We can show you that 618407 is a real Thetford number, what Thetford calls it, and which parts lists carry it. We have not verified that it fits your camper. That depends on your model year, build date and what is actually installed, and we do not publish a fitment claim until we can show it in the manufacturer’s own document.
Current marketplace inventory
Listings from eBay
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