Join Date: Feb 2004
Location: Lexington, Kentucky USA
Cooling fan relay 12V 2335/ B047
This relay is used on the 115 Spiders, GTV-6 and I presume, the Milano. Having seen a few of these, I noticed a common issue with one of the fuse clips apparently running hot, I presume on the load side of the circuit that carries the twin fans. The ones I have seen seem to have varying evidence of hot spots on the right side of the ATC fuse, as you hold the relay up to read the part number.
Now, I realize we're probably not looking at a root cause here, that the higher than normal resistance is probably due to old, gummed up fan motors, poor connections at the male/female plugs, or burned wiring. But the end result is overheated fuse clips that no longer grip the blades of the fuse as tightly as they once did, thus leading to more failures down the road. I discovered this while checking out a spare relay for an Alfista, before shipping it out to him.
I popped the cover off the relay, and inserted a blade of the fuse into each of the two clips, to compare grip pressure from the brass clips. The right side clip had virtually no grip at all, just what you'd call slight drag on the blade of the fuse. The left side clip had decent grip, it seemed like. I cleaned up the fuse clips and male spade connectors on the relay base with contact cleaner. In fiddling with the right side loose clip, I noticed that very little added pressure was needed to close it up and grip the fuse blade adequately. So, I cut a small piece of double-sided tape, leaving the paper on, and stuck it to the outer surface of the brass clip. I then slipped the plastic cover back onto the relay, observing the clip inside, and saw that the thickness of the tape was enough to allow the cover to add pressure onto the clip and close it up.
I then took some Stabilant 22 contact enhancer (from my 164 owner days), and treated both the ATC fuse blades and the fuse clips inside the relay, for good measure. I'm including a new 25 amp fuse with the relay, since the buyer is a 115 Spider owner. I want to pass along this simple fix for this relay, hopefully extending the life of the fuse clips and reducing resistance at that point.
Comments and similar experiences are welcomed.
Lexington, KY USA