Re: Dangling Alternator Question

On Nov 5, 6:19 pm, "." <yefelnag...@xxxxxxxxx> wrote:
On Nov 5, 5:25 pm, "richard cortese" <ricor...@xxxxxxxxxxxxx> wrote:

"." <yefelnag...@xxxxxxxxx> wrote in message
The extra voltage drop across this long lead causes the voltage
regulator to
think that battery voltage is higher than it actually is.
************
I think you mean the long lead causes the voltage regulator to think the
battery voltage is lower.

Right. I was trying to post and cook pasta at the same time and got
distracted. (1)

The battery gets overcharged because the extra connectors and the
ignition switch contacts and about six feet of small gauge wire keep
the zener diode from triggering and the SCR doesn't shunt excess power
to ground.

The diodes also have to put up with excess voltage from continual
charging and they tend to blow out.

The F650 has a $250 OEM regulator...

All BMW parts come with those very special
BMW prices.

I took a quick look at my BMW parts CD and
besides the regulator, they show a separate
diode (part #s 61 312 346 432 and 61 312 346 465)

Not sure what's up with that. Nice if you could
really replace them separately. I guess the diode
may not be for the main charging current though.
.

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