Automotive Circuit Protection - Part 2

Peter D. Hipson mail at darkstar.mv.com
Mon Jun 26 16:00:54 GMT 2000


Very true, which is why I never start the vehicle that is doing the
jumping, since it will be the one that takes the hit when pulling the
jumper cable(s), when the starter disengages, or there happens to be a bad
connection! BTW, that amount of load dump may well indicate a (small)
battery problem. 

At 09:47 AM 6/26/2000 -0400, you wrote:
>Hi Garfield, et al:
> Ive measured loaddump WAY above 70V, here is the scenerio, jump starting
a car.
>Car A is running ~3000 rpm Vbat ~14.4, car B cranks draw the combined A
and B 
>voltage down to ~9. Alternator is now pumping out Max power. When the
starter 
>is released  on car B the alt in car A is still putting out max power, even 
>with the battery I measured +186V.
> I took the alt back to get it tested and was told that the magnetic field
takes 
>time to decay, AND there is a small delay before the regulator can respond.
>
> Otherwise I agree with everything you've said

Thanks, 
        Peter Hipson (founder, NEHOG)
        1995 White NA Hummer Wagon
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