Hi All, I have an issue that his stumping me.
I installed a vintage air system in my car. However, when I turn the fan on, the voltage meter drops from a healthy 13.5- 14 to about 12. As such, if i run the car for an extended period with the fan on, my battery dies.
The alternator appears to be a stock unit as it continues to employ a voltage regulator. The back of the Alternator sates "Lucas" with no model number.
Likewise, even without the fan on, the dash and headlights get brighter as I rev the car indicating a non-constant voltage.
The car is new to me and I don't have any history on it.
Thanks
Paul
'68 etype voltage issues
#2 Re: '68 etype voltage issues
Not sure what a vintage air system is but it rather sounds as though the alternator is not generating much output. The voltage at the battery should be around 13.8-14.2 at anything above 1000 rpm with an alternator and unless your air system uses 40 + amps the alternator should be able to supply all the power it needs when the engine is running.
I think you will have an old style Lucas alternator with a separate 4AW (I think) regulator (small black box with three wires under the heater box) so it may be the regulator that is dead. Try replacing that first.
I think you will have an old style Lucas alternator with a separate 4AW (I think) regulator (small black box with three wires under the heater box) so it may be the regulator that is dead. Try replacing that first.
Julian the E-type man
1962 FHC
1966 MGB....fab little car too
1962 FHC
1966 MGB....fab little car too
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