Originally Posted by
scottevil
Chris,
That is dead on. Sorry for being lazy and not citing the N65 diagram and post. My brain is so overloaded with work stuff that I didn't have the energy to reply with detail. That bit about testing E5 is really, really interesting. I may do this, just because the engineer side of my brain hates not knowing. I have the car stored for the winter, but will dig it back out in the spring and test.
I would like to help others who might be in the same situation. Is the relay replaceable? I would prefer to fix this right, then have the jumper between E2 and E7...
Best Regards
Scott M
... everything is replaceable ... however, not sure if it makes sense here.
your current set-up is actually considered to be an upgrade to many (having pump always come on with key in run).
relative to repairing or replacing the relay in the N65 ... FIRST, I would confirm that it IS the problem.
I could not find a pic of an r170 N65, but I suspect it is fairly similar to this w210 N65
if you had the N65 in your hand, I would look for cold (poor) solder connections both at the connectors and at the relay. I burnt relay contact could be cleaned as well.
Alternatively, you could wire in a "bosch style" 30/40 amp relay (externally)
connect E2 to 86 and 30 (or, if want to be "perfect" , wire E2 to 86 AND A1 to 30 ... but it will work the same)
connect E5 to 85
connect E7 to 87
hope that helps,
Chris