12 Volt Test Lamp vs Multimeter
Discussion
I'm trying to diagnose and fix a problem with the heater on my wife's '97 Fiesta. I know there is a well-documented issue with the heater control valve (HCV), which electronically controls how much coolant flows through the heater matrix.
The HCV has been changed approx. 6 months ago, but the problem has returned. I have found a guide on the web on how to test the control panel for the HCV, which sends out a pulsed signal to the HCV. It mentions using a Test Lamp to check for a pulsed signal, "To check this you need to connect a test light to the live side of the battery and the other side to the black / green wire, then turn you temperature half way between min / max you should see the light be either on all the time or it will pulse on and off every minute or so"
What I want to know is, can I use a multimeter instead, as I don't have a test lamp? If so, what would be the best way to wire it up?
The HCV has been changed approx. 6 months ago, but the problem has returned. I have found a guide on the web on how to test the control panel for the HCV, which sends out a pulsed signal to the HCV. It mentions using a Test Lamp to check for a pulsed signal, "To check this you need to connect a test light to the live side of the battery and the other side to the black / green wire, then turn you temperature half way between min / max you should see the light be either on all the time or it will pulse on and off every minute or so"
What I want to know is, can I use a multimeter instead, as I don't have a test lamp? If so, what would be the best way to wire it up?
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