corrected copy!!
I apologize for the bad "display" but the info was in a table which
didn't work.
Pat
Pat Harris - "sammler" wrote:
> 1962 MGA 1600 MKII
>
> I would like to know what some of the "normal" voltage readings should
> be for a system in good operating condition.
>
> I'm having charging circuit problems - the Ignition light remains
> illuminated as long as the switch is ON.
>
> I've read quite a bit of info about testing the dynamo and how difficult
> it is to accurately test the control box but I thought that there should
> be some "starting" point with "good" voltage readings.
>
> Here is info I have but it is with the charging system which has failed.
> :-( For all readings the engine is NOT running!
>
> Control box Voltage reading
> Ignition Switch
> OFF ON
> E 0 0
> D 0 7.82
> F 0 7.82
> A 13.07 12.49
> A1 13.07 12.49
>
>
> Voltage to coil 12.10
>
> Voltage on yellow wire going to D terminal but NOT connected to dynamo -
> 7.83 (therefore the wire is OK)
>
> Voltage on yellow-green wire going to F terminal but NOT connected to
> dynamo - 7.82 (therefore the wire is OK)
>
> readings with dynamo installed when failure was noted
>
> Voltage at dynamo D terminal (large terminal - yellow wire -
> Ignition ON) .35
> Voltage at dynamo F terminal (small terminal - yellow-green wire -
> Ignition ON) .35
>
> if dynamo is connected but NOT installed, therefore NOT
> grounded, the voltage on either terminal is 7.82
>
>
> readings with another dynamo installed - from a parts car - installing
> it did NOT solve the problem
>
> Voltage at dynamo D terminal (large terminal - yellow wire -
> Ignition ON) .63
> Voltage at dynamo F terminal (small terminal - yellow-green wire -
> Ignition ON) .63
>
> if dynamo is connected but NOT installed, therefore NOT
> grounded, the voltage on either terminal is 7.86
>
>
> If someone having a car with a good charging system has a chance to
> check the voltages I'd sure like to know your findings.
>
> Fortunately replacements for the control box and dynamo should be here
> this week. Planning ahead may have paid off as I ordered them the day
> before the system failed. :-)
>
> Thank you and Happy New Year,
> Pat
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