[Healeys] current draw of wipers

Michael Salter michaelsalter at gmail.com
Sun Mar 14 09:42:51 MDT 2021


Yes Bob I would agree and when the motor is cold it will pass more current
as I understand it.

M

On Sun., Mar. 14, 2021, 11:36 a.m. Bob Haskell, <rchaskell at earthlink.net>
wrote:

> Mirek,
>
> I believe that stall current is the load developed when the motor is not
> able to rotate - the mechanism is locked up - wipers frozen to the
> windshield.  I"m an oldish mechanical engineer, not electrical.  So
> someone else may have a better answer.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 3/14/21 10:31 AM, m.g.sharp--- via Healeys wrote:
> >
> > Happy Sunday!,  I am making some decisions on bulbs (and the LED
> > equivalent) for some Lucas Spot lamps I am fitting to my BT7, and I am
> > concerned about the total draw if I have headlamps, spot lamps and
> > wipers on.  I know it is getting close to the measly 22 amp max output
> > of the generator.
> >
> > The manual has specs for the wiper motor: “normal running: 2.3 to 3.1
> > amps”. Then is gives “Stall Current” for the motor hot as 8 amps and
> > for the cold motor 14 amps.  My question is, what is “Stall Current”?
> > The draw is huge compared to the normal running draw.  Also, by cold
> > motor, I assume they mean the wiper motor as I cannot see how the
> > engine temp would matter. However, although I get it that electric
> > motors generate some heat, I don’t think of them as “warming up”, or
> > running hot or cold, so the huge difference between  “hot motor” and
> > “cold motor” stall current further confuses me.
> >
> > Any help from the electric whizzes out there would be appreciated.
> >
> > BTW – regarding bulbs for the Spots, I like the idea of using LEDs as
> > the current draw is so low and the light better, but I find that
> > bright piercing light inconsistent with the character of our cars (a
> > personal preference) and the price of them is almost 3 times a BPF 48
> > W quartz halogen bulb.  I also consider that I have been driving my
> > BT7 for 46 years without spot lamps and got along OK, so I question
> > the need to go to LEDs, other than the advantage of low current draw.
> > Any experiences from those of you who have spot lamps with
> > conventional bulbs and the older low output generator (i.e. BT/BN7 and
> > earlier), would be appreciated.
> >
> > Cheers, Mirek
> >
> >
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