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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Rev counter on a PV544Views : 422 Replies : 6Users Viewing This Thread : |
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Jul 30th, 2023, 17:19 | #1 |
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Rev counter on a PV544
Hi. I want to install a rev counter on my pv. Instructions say signal wire on gauge to negative side of coil. Prob is, there only two wires on the "armoured" coil, the thick one to centre of dizzy an one thin one to side of dizzy. There are no marks on coil to say if is poz or neg. Advice please, all vintage auto sparks. Thanks.
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Jul 30th, 2023, 17:38 | #2 | |
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Quote:
It’s the pulse of the negative coil as it’s grounded by the points closing that’s used as the signal |
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Jul 30th, 2023, 18:33 | #3 |
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Righty, ta. Will try connection to that terminal. I see u at MK., we used to live at Wavendon. Cheers.
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Jul 30th, 2023, 19:22 | #4 |
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The signal wire goes to the terminal that connects to the points on the distributor. This is the negative. The positive is hidden inside the armored wire that goes to the ignition switch inside the car.
If it is a modern multi-cylinder instrument that requires additional 12 volt power to function, it should still work fine on a 6 volt system if you have that. If it is an old school instrument with two wires, then the "positive" goes to the coil negative, and the other to body ground.
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1958 Amazon 4-door saloon |
Jul 30th, 2023, 19:58 | #5 |
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Thanks Samaron. Tis 12v. New electronic gauge. ****ing down her, but might stop after tea, whereupon i shall nip out an test. Y'health, Mark.
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Jul 30th, 2023, 23:39 | #6 |
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With the GT gauge the tach signal wire replaces the wire from the neg on the coil to the dizzy as per this drawing. It counts the sparks going from the coil to the dizzy and divides it by 4. The pos on the armoured coil goes from the ignition switch to the underside of the coil.
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Aug 1st, 2023, 23:51 | #7 |
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I connected signal terminal on tach to visible wire dizzy to coil, works fine.
Thank you, people. |
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