Originally Posted by GraphiteGhost

Per a number of well published posts, and a few very helpful dedicated members, we know those relays are sometimes not the best for the application (bad contacts/excessive current draw which pitts the contacts excessively/defective relay which 'hangs' before complete mechanical throw/cheap low quality solder used during assembly/anything not yet mentioned). There are a couple of members who volunteer their time and efforts for quite the low price, that installs (or has sources for those who are capable of replacing themselves) and modifies a couple of places on those RCM's including new relays that are either damaged beyond repair or just not serviceable at all. One thing I would do before sending an RCM (and thats just me, and I would send it only because I am now at the age of physical decline that my close-work soldering skills may not be what they used to be given the location where the work is needed, to put it mildly) a voltage/current check of the air pump, at the air pump [and] the rating of the part itself (if there is a specification available to compare it too). This small step would help insure any relay repair/replace will have the chance of being more successful given the contact rating doesn't approach approximately 75-80% of rated current at applied voltage (yes, 75-80%, because as voltages vary across the operational rpm's of the engine, higher or lower current is required vs the voltages available at the pump motor, to run the pump as neccessary). Main reason I would do this, is if the part is drawing too much current, the whole process will have to be repeated again down the road. Now, if that replaced relay is of a higher current rating (for its contacts) you still have to be aware of the tracks on the circuit board (cross-sectional totality of conductors) and that they are also able to handle the increased current draw (if present). Whole circuit concept, sometimes these little fine details get overlooked in the rush of the moment. When something fails, its easy to fix, when a few more have the same problem then something slipped by the engineers or the builders. Sucks having to back-design (so to speak) but we all help each other to solve problems across the platform. I can use a good example where people put those mega amplifiers in their cars and wonder why the battery and alternators are constantly needing replacements.