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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