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Thread: 12V ignition on 24v 101 - please explain?

  1. #11
    Mick_Marsh's Avatar
    Mick_Marsh is offline Super Moderator Silver Subscriber
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    Craddock lists the coil as a 24V.
    552765 - Ignition Coil 24 Volt. Military Vehicles

    My parts book lists the 12V coil as p/n GCL111

    It lists the 24V coil as 552765. It also lists the box Garry has shown as "Filter Unit", not voltage dropper. Think about it. The 24V 101s may have had radio gear. You didn't want noise generated from ignition coils and fuel pumps interfering with the radio signals.
    Unless otherwise stated, this post is the opinion of Mick_Marsh and should be read accordingly.

    Hybrid SIII Stage 1 cab on a RRC chassis

  2. #12
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    Just checked the wiring diagram..........24 volt vehicles.
    Both fuel pump and coil appear to be 24 volt with filter boxes on the supply.

  3. #13
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    101repair manual introduction is as follows
    12v...alternator 16 acr 34a...6 volt coil...12v distributor.
    24v...alternator 24v 90a fully suppressed with a shunt box if radio batteries fitted....10v coil with filter V.dropper.24v distributor with double contact breakers fully screened and engine speed limiter...fuel pump has V.dropper

  4. #14
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    Normally for a 24 volt system suppressed type , for it to work well the coil needs to be 12 volt or lower as it reduces the capacitance of the supressed High tension leads by half and therefore you get a spark at the plug that will do something.
    Some one will have to find a 24 volt 101 which has not been played with, to get the true answer.

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