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-----Original Message-----
From: jonathon <jemery@execpc.com>
To: Military Vehicles List <mil-veh@uller.skylee.com>
Date: 15 January 2000 15:29
Subject: Re: [MV] CUCV alternator light turning on when started
>>James is quite right and this is a real catch. The initial rotor excitation
>>(magnetic field) is generated by the tiny current through the warning light,
if
>>that bulb pops you can spin the alternator until hell freezes over and nothing
>>will come out of it.
>
>Yes, and for this reason, it is not a bad idea to install a permanent
>resistor in parrallel with the bulb so that if the bulb blows the resistor
>will still allow the alternator to function
>
Exactly so, some UK cars were so fitted too, assuming the average warning light
is 1W or so then 500 - 1K ohm should do.
The standard UK fighting vehicle 24V alternator "Generator No.10 Mk.9" and its
associated external control unit "Panel, generator No.9 Mk.3" are configured
quite differently to the normal automotive system but still use the warning lamp
for initial excitation without, surprisingly, any "safety" lamp bypass
arrangement.
Richard
(Southampton UK)
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