Alternator in Oregon

The connections corrode before the machine does

Damp air works on the exposed side of an alternator: the terminal stud, the plug on the regulator, and the earth strap between engine and body. A resistance in any of those looks exactly like a failing alternator on a meter at the battery, and is a fraction of the price to fix.

Check the charging voltage at the alternator's own output and then at the battery. A meaningful difference between the two is a connection, not a machine.

Coastal rain and salt air on the west side.

An alternator breathes whatever the road throws up

The case is ventilated, because the machine has to shed its own heat. On unpaved roads that means it is drawing dust through itself continuously, and the dust ends up on the slip rings and in the bearings.

A whine that rises with engine speed rather than road speed is a bearing. It is worth catching, because a seized alternator bearing does not stop at the alternator — it takes the belt, and everything the belt drives goes with it.

High desert on the east side — one state, two surfaces.

The climate, in a number

Portland's normal annual precipitation is 36.92 inches against just 4.2 inches of snow: wet nearly all winter, frozen almost never. Every one of those days is a day the cooling fan, the air conditioning clutch and the blower are all drawing at once, and the alternator is what carries them.

What goes on the roads in winter

Magnesium chloride goes down with a corrosion inhibitor mixed into it, alongside solid rock salt, used both before a storm and during one. What is spread on the road reaches the alternator through the same wheel-arch opening that cools it, and a case packed with salted grit runs hotter than one that is clean.

The dry side

East of the Cascades is high desert: hot dry summers, cold clear winters, dust, and long distances between towns.

That ages a car through ultraviolet and heat rather than through moisture. Rubber bushings harden and crack rather than rusting away. Plastic cooling components go brittle. Headlight lenses haze. Batteries die from summer heat and reveal it in January.

What else Oregon does to a car

De-icer on the passes rather than statewide salting.

Cascade and Coast Range grades.

What we hold, and what it costs

5 options from Bosch, Cardone, Denso, Remy and Valeo, from $239.99 to $309.99. Prices are firm — where we have no price we publish none.

We are a reseller rather than a manufacturer: we source the part, check it over and sell it, and we confirm it against your year, make, model and engine before it ships rather than asserting a fit on the page. We ship anywhere in Oregon, including Portland, Eugene, Salem and Gresham.