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Author Topic: Voltage drop?  (Read 423 times)
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simonpen
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Posts: 104


« on: 26 June, 2021, 04:12:14 PM »

My Coupe suffers a loss of revs when the lights are turned on. Eventually the engine will stall. I have an electric pump and an alternator. The revs start to drop the instant the lights are turned on. What, in terms of electrical principles,  might be happening?
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1969 Rallye 1.3S
lancialulu
Press Officer
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« Reply #1 on: 26 June, 2021, 05:39:38 PM »

Lights should draw max 300w which is less than 1/2 horse. May be you have an earthing problem affecting the volts to the coil?
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1972 1600 Fulvia Sport
1979 2500 Gamma Coupe
1988 Delta 1.6GTi
1998 Zeta
davidwheeler
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« Reply #2 on: 27 June, 2021, 01:03:17 PM »

If in doubt seek out, remove and clean all earth points.   They are notorious for doing this sort of thing.   It would be interestin to know the voltage across the battery when you switch on the lights.  It may even be the terminals themselves at fault.
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
simonpen
Senior Member
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Posts: 104


« Reply #3 on: 28 June, 2021, 01:57:39 PM »

Thanks both. It looks as if the neg terminal may have been the culprit. The screws in the clamp were very loose and I had not tightened the clamp properly. In between times I have been to a tuner of engines and it is running better at idle as well so now when the lights are on it keeps going. ta
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1969 Rallye 1.3S
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