Low Cranking Voltage at Key switch 9volts.

[Nauti St Tropez]

So ran into a problem installing electric fuel pump 3 way safety switch. There needs to be 12v cranking on 1 terminal to pre prime the pump before the oil pressure switch takes over. Problem is i only get 9 volts at solenoid. If i remove yellow/red from key switch and crank it there is 12v. I ran separate wire to solenoid and key same issue. Key switch was replaced do you think solenoid is bad? I had to repower this Mercruiser 5.7l vortec and the only way it came was with a electric fuel pump. I read 8 to 12v is ok for normal conditions at solenoid but this switch needs 12v cranking. Main harness connector good and all grounds are good. New battery cables as well as starter. 1992 Rinker Fieste vee.

 

[mlewis0113]

What does your voltage measure coming out of the key switch in the 'start' position?

 

[Bondo]

So ran into a problem installing electric fuel pump 3 way safety switch. There needs to be 12v cranking on 1 terminal to pre prime the pump before the oil pressure switch takes over. Problem is i only get 9 volts at solenoid. If i remove yellow/red from key switch and crank it there is 12v. I ran separate wire to solenoid and key same issue. Key switch was replaced do you think solenoid is bad? I had to repower this Mercruiser 5.7l vortec and the only way it came was with a electric fuel pump. I read 8 to 12v is ok for normal conditions at solenoid but this switch needs 12v cranking. Main harness connector good and all grounds are good. New battery cables as well as starter. 1992 Rinker Fieste vee.

Ayuh,...... Welcome Aboard,...... Is the slave solenoid puttin' out 12v, when the key is in the "Start" position,..??