When placing the alternator low on the cool side of a Renesis, an idler
   pulley is necessary to avoid interference with the crank position
   sensor. If a tensioning idler pulley is used, the alternator can be
   fixed in place without an adjusting arm.

   There is limited space to install a pulley, so a small unit is best. A
   few units are small enough to possibly fit in the available space
   (first 3 pics). Timing belt idlers are often smaller, lighter and
   simpler (last pic). Am I correct to assume that most timing belt
   pulleys and their bearings are NOT designed to handle the loads of a
   serpentine belt running the water pump and alternator?

   Scott Gettings

   Good work Scott. Thanks for all the idler pictures.

   Yes. Best use an idler designed for the job.

   Paul Lamar ...No rotor no motor.

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This is a concern on my application- my '93 has a serpintine belt, the
water pump is run off of the backside of the serpentine belt. I have an
oversized pulley on the 40 amp alternator. I am concerned that I will
get slippage on the waterpump at high RPM, and was thinking that if I
could incorporate an Idler pulley, I could get more wrap of the
serpentine belt on the water pump.

Suggestions?

I can send a photo on Monday if that will help.

Brian Trubee

RV-4, waiting for a prop, ELT,transponder, and pilots's license.

We will be closed starting tomorrow for a few days.
Trip to Albuquerque.