Re: Cranking voltage
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Webmaster
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What is the voltage across the actual battery terminals when cranking?
Posted on: Today 10:25
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cranking voltage
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Forum Ambassador
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And more importantly what is the voltage at the coil terminal being fed from ign switch while cranking. 4 volts is low and the spark is usually very weak and often can't jump the plug gap when under compression if the voltage at the coil is much less than 5v.
Posted on: Today 11:04
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Howard
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Re: Cranking voltage
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Home away from home
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Quote:
Yes, I would expect at least 4.2V. I would check the voltage across the battery. Then I would check the voltage between the battery post and starter terminal (not the battery cable lug on the solenoid) when cranking. Should be very low, maybe 0.1V. An excess drop indicates either an undersize cable and/or a worn out starter solenoid.
Posted on: Today 11:38
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Cranking voltage
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Home away from home
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Thanks. I did test at the battery side of the solenoid and got 3.9 to 4.0 on a Fluke digital meter. Didn't check the starter side, which I will do, and I haven't cleaned or tightened the ground cable to frame connection.
Posted on: Today 15:13
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Re: Cranking voltage
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Home away from home
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Are you using at least 0 AWG cables?
Posted on: Today 15:33
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