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I have a 1970 Lightning and there's two light indicators on the headlamp on opposite sides of the switch... A red light (right) and green light (left). I've found an incomplete wiring diagram... and the green light seems to be a headlamp beam indicator... But the red light isn't included on it for some reason... Can someone tell me what the red light means? It doesn't light up... Thanks!

Last edited by Chitown guy; 10/12/21 5:29 pm.
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The red light is the oil pressure warning light, it should be on when the key is turned on but the engine not running. It should then only switch on if the oil pressure drops below 5psi.


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Oil pressure switch is a Smiths PS.5300/1/07 (according to the Workshop Manual) which should mean 7 PSI.

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Originally Posted by DMadigan
Oil pressure switch is a Smiths PS.5300/1/07 (according to the Workshop manual) which should mean 7 PSI.
My mistake, I was thinking of the earlier switch.


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Smiths switch 7psi + or - 5psi.


Moderated by  Allan G, Jon W. Whitley 

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