[s-cars] Fuses

David Forgie forgied at shaw.ca
Tue Mar 4 07:50:11 PST 2014


Martin: I presume by "special green fuses", you mean the thermal fuses that are in various locations in the UrS4/S6.
These are bi-metal spring type fuses that can take a bit of initial power surge above their nominal rating that would
likely fry a conventional spade-type fuse. If the power draw continues at that higher level, the thermal fuse will 
open and stop current flow. When the temperature of the fuse cools down, the contacts are closed again, i.e. it is
an automatically reusable fuse.  On this basis, personally, I would leave them in place or replace like with like,
with one exception:

The UrS4 has thermal fuses above the ECU that are involved with the ignition. Some UrS4 owners (e.g. James M. (JaMu)),
have found that intermittent ignition faults were cured when those thermal fuses were replaced with convention spade
fuses of the same power rating.  In contrast, the UrS6s use spade fuses above the ECU, as discussed here:

http://forums.quattroworld.com/s4s6/msgs/137287.phtml

Some other locations of the thermal fuses include the "lunch box" relay and fuse panel under the hood (which incidentally
contains a number of green topped 30 Amp thermal fuses):

http://forums.quattroworld.com/s4s6/msgs/152019.phtml

Another location is the passenger door kick panel replay panel:

http://forums.quattroworld.com/s4s6/msgs/154145.phtml

Hope that helps,

Dave F.


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