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Need help re-installing BN4 heater

Posted: Sat Aug 19, 2017 12:33 pm
by AdamH
Hello all, maybe someone can help me with my heater re-install?
I have a 710k that came with a BN4, but it wasn't installed. It definitely came from this Pinz as the wires are cut off in the same fashion.
Luckily they left some ends, so I can match the colors when i put it back in. However there are a couple that are uncertain- there are 2 brown wires on the heater, and there are 2 brown wires in the Pinz- but I'm unsure which ones go where. On the heater one of the brown wires is with the other on the top harness, the other one comes out by the air inlet.
Also, in the main harness of fetch top there is one thicker black wire with a fuse that doesn't seem to correspond to anything in the Pinz. usually thicker black wires are ground, but I don't want to make any assumptions on this one- plus ground wires don't typically have inline fuses.

Any help would be fantastic!
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Re: Need help re-installing BN4 heater

Posted: Mon Dec 18, 2017 4:47 pm
by boeing7873
Did you figure out the wiring???
Sorry I just looked at your post...

Re: Need help re-installing BN4 heater

Posted: Mon Dec 18, 2017 6:52 pm
by AdamH
Yeah, I did finally get the wiring figured out, thanks for checking in!
Right now its running, but I'm getting a lot of smog out the tailpipe and can't figure out why.
Any ideas on that?

Re: Need help re-installing BN4 heater

Posted: Mon Jun 11, 2018 12:11 am
by boeing7873
Adam,
Just did a rebuild of my BN4, removed about a pound of carbon deposits from the burner can. Quite a job to get to it. Now I am having the same question you had... the brown wires!!! I can't recall which one goes to the pump!... No worries, I will figure it out, there are diagrams online!

Re: Need help re-installing BN4 heater

Posted: Sat Aug 25, 2018 11:45 pm
by boeing7873
https://pinzforum.kiruna.de/viewtopic.php?t=8974

This guy has the right docs on wiring a BN4 in pinzs.
Too bad the resolution is too low. I will try to ask for better photos.