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I know this has been covered a few times, well close but not the same.. and ive not managed to find the answer through older threads.
So, I want to bench test my starter motor. The problem is that it has 4 connections... 3 and I would be ok, but I don't know what to do with the 4th and don't want to fry it.
Can anyone label them for me in this picture please?
Ok, so (with a fully charged battery!) ...connecting permanent 12v positive to connector '2' and ground to the case (which I believe is the same as connector '4'), then tapping 12v positive to '3' spins the starter... so I know it works.
1 is (15a) output to boost the spark voltage - active while starter active
2 is (30) the battery connection
3 is (50) starter signal from ignition switch / ignition relay (depending on year)
4 is (31) the grounding lug for the solenoid to the starter case (starter is grounded by bolting it to the block)
15a will have battery power while the starter is engaged - it is switched by (50) just like the starter solenoid/relay
I think 15a should have been called 50a (or e.g. 50z) for better functional understanding - it is NOT ignition (15) related
1 is (15a) output to boost the spark voltage - active while starter active
2 is (30) the battery connection
3 is (50) starter signal from ignition switch / ignition relay (depending on year)
4 is (31) the grounding lug for the solenoid to the starter case (starter is grounded by bolting it to the block)
15a will have battery power while the starter is engaged - it is switched by (50) just like the starter solenoid/relay
I think 15a should have been called 50a (or e.g. 50z) for better functional understanding - it is NOT ignition (15) related
Alan
thanks Alan, that helps massively. Seems like my starter is working correctly as well
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1979 Starter motor testing
