Circuit tester question
Discussion
Hello, I have a Plasplugs power tester (Model PT 119 UK) and need help interpreting it.
The high-level brake light on my Caterham has stopped working. I pulled the connection from the brake circuit loom to the brake light and wanted to test that there was a signal being sent i.e. power when the brake pedal is pushed.
The tester as you can see has two lights in the shape of an up and down arrowhead. When I took a reading from the two "loom" wires with the ignition ON and the brake pedal pushed it just lights the UP arrowhead which apparently indicates the red probe (of the tester) is detecting DC+. With the pedal not depressed both lights are out.
I was expecting both to light up and this has confused me. I tested the circuit on a 12v garden light which was ON and both arrowheads lit up.
Does the result on the brake circuit show me that there is a continuity issue on the DC- side of the circuit?
The high-level brake light on my Caterham has stopped working. I pulled the connection from the brake circuit loom to the brake light and wanted to test that there was a signal being sent i.e. power when the brake pedal is pushed.
The tester as you can see has two lights in the shape of an up and down arrowhead. When I took a reading from the two "loom" wires with the ignition ON and the brake pedal pushed it just lights the UP arrowhead which apparently indicates the red probe (of the tester) is detecting DC+. With the pedal not depressed both lights are out.
I was expecting both to light up and this has confused me. I tested the circuit on a 12v garden light which was ON and both arrowheads lit up.
Does the result on the brake circuit show me that there is a continuity issue on the DC- side of the circuit?
It's not very clear but it looks like both arrows would only light up if it was ac. Your outside light may well be ac.
The result you got seems correct - it was showing the red probe was connect to the positive 12V. If there was a break in continuity then the tester wouldn't show anything as there would be no circuit. if you reversed the probes then the lower arrow would light up because the red probe would be connected the negative 12V.
Check the tester across the battery and see what you get in terms of which light comes on.
The result you got seems correct - it was showing the red probe was connect to the positive 12V. If there was a break in continuity then the tester wouldn't show anything as there would be no circuit. if you reversed the probes then the lower arrow would light up because the red probe would be connected the negative 12V.
Check the tester across the battery and see what you get in terms of which light comes on.
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