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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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lamp bulbsViews : 861 Replies : 3Users Viewing This Thread : |
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Oct 31st, 2014, 14:25 | #1 |
arcturus
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lamp bulbs
Y'all must be getting fed up with me by now but I have another query. I am changing over the head lights on the PV from the old style bulb on the left of pic' to the new style next to it. I have this adapter which takes the three blades. I need to know which blade is earth, which is high beam and which is low beam. I assume that they are all the same.
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Oct 31st, 2014, 19:49 | #2 |
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Oct 31st, 2014, 20:49 | #3 |
arcturus
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Obrigadinho, that's Portuguese for "more than thank you" The thing about Google is that you need to be able to ask the right question.
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Oct 31st, 2014, 23:11 | #4 |
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If you have a multimeter set it to ohms. Measure the resistance from each terminal to the other. You will find that from one terminal to each of the other two the resistance is the same. That terminal is the earth.
This can be tricky especially with low voltage bulbs: a dirty connection at the multimeter probe can affect the reading at such low resitance values. There is another way. Look carefully into the capsule and one prong will have two filaments welded to it. That is the earth. The filament under the reflector hood is the dipped.
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Mike Arnold. 1966 122S Last edited by Mike Arnold; Oct 31st, 2014 at 23:14. |
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