Eberspacher B2L short

[scoobert]

First post for quite a while. Eber blew fuse at fusebox when restarting when the temp dropped a couple of weeks ago. Took it off, had a look round, tested the thermal switches, all ok. Put it back together and test fired off the van, all good, ran as it should. It even needed less from the battery than usual to get going. Put it back on the van, tried it, blew fuse instantly. Had it all off again, can't find a short. Anyone have any ideas?

Yours in hope,

Chris