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The air con. blower on our Peugeot 407 HDI won't operate. We've traced the problem to the 40A fuse in the engine bay- it's not receiving full voltage from the relay next to it. When we tap it, we get a momentary increase. The blower starts up if I feed full current to the fuse.

The whole fuse/relay assembly is sealed in resin, so can't be repaired.
Instead of replacing it with a second-hand one (which may have other issues)
I plan to bypass the problem by installing a separate relay to feed full power downstream of the dodgy relay and fuse.
If the relay is protected by its own 40A fuse and triggered by the "ignition" circuit, can any foresee any problems?
 
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