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random no crank mystery 900 1994

posted by  Amarin on  Sat Jan 24 10:49 CST 2015
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Hi,

The terminal 50 shouldn't have any voltage at KP II. Only at KP III (to power the starter motor). Looks like the switch (labelled as 3/1) is defective. Please refer to diagram below taken from Volvo wiring book 1994. Bosch and Regina wirings are the same.

Measuring voltage at the terminal 50 (KP III) shouldn't be taken as the switch is OK. The voltmeter only draws minimal load on the switch. Its the current (ampere) that the switch can deliver to the starter solenoid that counts (I was hoping the 12v light test would draw more power than the voltmeter).

One more test. You could put two single wires - one to terminal 30 (batt power) and another to terminal 50 (at the switch). Terminal 30 wire is red, terminal 50 pink.

When in no start condition later keep the key pushed in KP III position while SHORTING the two wires. The idea is to augment current delivery to the starter solenoid. If it starts then its the switch that's defective (as it can't deliver that much current). If its not then its the starter.

Anyways I'm suspecting the switch is defective as it has voltage at terminal 50 in KP II (maybe too much metal shavings in an old switch could produce this). The switch could not be cleaned. Has to be replaced.



Amarin.






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