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
Ignition
OFF
Volts
Ignition ON
Volts
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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