Ferrari Mailing List: Re: 308/Mondial window motor current

[robert_h_bowser [at] juno.com (robert_h_bowser]

If I remember correctly, the equation is:  I = V/R  (Ohm's Law)

So...rule of thumb...to get the maximum, simply measure the resistance in the 
motor windings (at the motor) using a good Ohm meter, divide that value into 
14.5 (nominal voltage), and you get maximum current (i.e., stall speed 
current). Set the fuse at 1.5 to 2 times that value and you should be OK 
(assuming the feed wires and all other elements of the circuit can handle that 
current/voltage).

Not sure why you want the operating current value, as it does not relate to the 
fuse requirements.  The current draw will vary depending on the rotational 
speed of the motor and the load it is subjected to.  I imagine it should be on 
the order of 1/3 the max value.

Of course, I'm an electronics engineer who has never taken any engineering 
courses, so I may be wrong.  But I have had my 308GTS for almost ten years now, 
and it has not caught on fire...yet!

Bob

-- Rick Lindsay <rolindsay [at] yahoo.com> wrote:
Hey techno-gimboids (like me),

What is the average operating current of a 308/Mondial window motor?  And what 
maximum or stall current might one expect for a sticky or stuck window?  I ask 
because I want to run large gauge power wires to my doors and I want to fuse 
them appropriately close to the power source.  The size of that fuse and the 
gauge of the wire is related to the stall current of the motor, thus my query.  
Advice?

rick
'83 Mondial QV
'79 308GTB
other stuff
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