Q: Some time ago (maybe a long time ago), you indicated you would look into aftermarket rain-sensing wiper switches. Did I miss your report on that? Also, are there any such switches that can also turn on the headlights?
_Valther N.
A: Oops! I get a little scattered when researching things sometimes, as my list of want-to-do's is lengthy and I do experience the occasional gray moment!
The only current seller I could find for an add-on rain-sensing wiper system is Bluewireautomotive.com. Their kit runs about $150 and claims to be easy to install (by a pro perhaps). A popular predecessor was Raintracker, but they've ceased manufacturing kits due to low demand and concerns of proper hookup on today's sophisticated cars. (Try SigmaAutomotive.com for possible remaining stock; $100). That's my concern as well, as modern vehicles are fussy about modifications, and wiper systems can be diverse in their control methods. Regarding your second question, Beechhurst Inc. builds and sells a U.S.-manufactured automatic headlight module that includes wiper-on input. This looks to be a really robust product sold for about $135. Professional installation is strongly recommended.
In my automotive electrical class, I assign a virtual wipers on/headlights-on project for my students to research and assemble. They use their own cars as the subject, looking up wiring diagrams, determining system control methods and plotting the best access points for connection. Circuit protection, robust relay control and no compromise of existing headlight function is a must. Some go on to build it after their design is approved.
Q: I was planning to replace the spark plugs, among other service tasks, in my Hyundai Tiburon and mentioned it to a co-worker. He said I should use "hotter" spark plugs for the best performance. I didn't ask what he was referring to and thought I'd check with you to see what this is and if it's a good idea. Help?
_Hector R.
A: The term "hotter" spark plug typically refers to the heat range of the plug. I would absolutely go with the manufacturer's specified heat range unless unusual operating conditions might exist. A "hotter" spark plug operates at a higher temperature, which could lead to detonation (the air-fuel mixture explodes as opposed to a controlled burn) if used under high-temperature, demanding conditions. This can cause engine damage! The only time such a plug might be considered is in a vehicle that is operated for very short distances only, and spark plug fouling has been an issue. A "colder" spark plug resists wear, but may be prone to fouling unless use is primarily longer highway trips.
You may choose from conventional electrode plugs, platinum electrode, double platinum and iridium electrode plugs. Platinum and iridium are expensive metals that are used in a fine wire center electrode and sometimes a disc on the ground electrode, offering primarily longer life, along with claims of improved performance. The significantly higher cost of platinum and iridium plugs can be justified in engines with difficult to access spark plugs and those specifying longer service intervals. I'd stick with the spark plugs specified by the vehicle manufacturer!
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