To Group, Another issue with my wiring. After installing the
resisters required for my injectors I decided to check the voltage.
I get 12.01 volts into each resister and 12.01 volts out of each
resister. This doesn’t seem right to me; I thought a resister was
supposed to reduce the voltage going through it. FWIW the rating for
the resisters I am using ( as per the instructions ), is 5 ohm-25
watt. Thanks for any and all comments. Frank Clementi

It only reduces the voltage if there is current through the
transistor. You will need an O scope to see the voltage drop.

Cheap O-scope can be had for computers with USB connectors.

Paul Lamar

Most DMM have high or low store reading capability. When the system
is running, measure the voltage out of the injection. On an
oscilloscope you will see the voltage as it goes high and low. Input
should be battery voltage or the charging voltage from the
alternator. The computer side should drop to almost zero volts when
the injection is on. When the transistor turns off the voltage goes
to battery volts.

Dale Davies

There are good explanations in this thread but lots of people just don't
get Ohm's law. Frank, don't worry about your resistors. You can take it
on faith that if it's a 5 ohm resistor, it will drop the voltage by 5
times the number of amps flowing through it. If I understand the circuit
correctly, 12 volts is applied through the resistor to one side of the
coil. The other side is connected to ground only for an instant, so
current flows only then, and you don't see the voltage drop for that
instant on your meter.

David Josephson

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