Re: Can I use an 8 amp diode to stop alt leaking back on switch?

Posted by jdemaris on November 21, 2013 at 17:26:54 from (70.194.2.74):

In Reply to: Can I use an 8 amp diode to stop alt leaking back on switch? posted by Shealray on November 21, 2013 at 13:02:10:

I've seen SI series (10SI, 12SI and 18SI) draw up
to 2 amps @ 12 volts on the field/excite circuit.
So in reality - a single 3 amp diode is fine. Two
in parallel just gives extra insurance. So does
using a 5 amp or 10 amp diode. You can't use one
that rated for too much amps. But if you use one
for too little - it will blow like a fuse.

Many automotive circuits use a resistor instead of
a diode. It can be done either way - or with
neither and a switch used instead. Momentary,
pressure sensing, etc. The problem with a
resistor is - if not matched correctly -enough
current can pass and prevent engine shut-down.
This is especially true with diesels with electric
shut-offs. Unlike a resistor that just lowers
voltage (resists current and does not stop it) - a
diode is an electrical one-way check-valve.

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