I was doing some checks after fitting a new rectifier to a Denso 105amp alternator on a tintop --- Out of curiosity I put my DC clamp meter round the Warning Light circuit the result was a surprisingly high 0.95 amps key on engine off. This high current requirement might explain some of the charging problems some builders are having. even when using old fashioned bulbs for warning light.

[Edited on 25/6/16 by britishtrident]

0.95A indicates you are using at least a 12W bulb (or no bulb at all), normally the bulb acts as a resistor limiting the current,
I don't know what wattage they normally recommend for these alternators, but the old lucas ones were normally 2W (ie approx 160mA)

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Originally posted by gremlin1234
0.95A indicates you are using at least a 12W bulb (or no bulb at all), normally the bulb acts as a resistor limiting the current,
I don't know what wattage they normally recommend for these alternators, but the old lucas ones were normally 2W (ie approx 160mA)

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Denso normally have a resistor in parallel with the lamp.

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