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Is my dynastarter going to be just a ...

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Username: sixareen

Post Number: 1
Registered: 05-2013
Posted on Thursday, May 09, 2013 - 07:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

This will probably be the first of many sabb-related yelps for help!
I'm about to start getting an old North Isles Yole ready for sea. it's evidently been a workhorse in its time but appears to be seaworthy. She has been fitted with a Sabb single cyl short stroke (H I think?) & matching VP drive. engine seems in reasonable condition, turns over on the hand crank and I can feel a bit of resistance with compression on.
I note that there is a Bosch dynastarter AND an alternator harnessed up, which tells a story. Ive got the dynastarter off the lump and in a testing jig. In start mode, the dynastart spins up lovely with loads of torque. so I think that part of it is OK.
when I spin the dynastarter at 3000rpm, I get only 0.8-1V output on D+ with everything open circuit.
This drops to 0.2V when I ground DF.
Ive tried flashing the field which got the original 0.8V up to 1V
does this mean the exciter coils have shorted?
I see 4 Ohms from DF to ground
are there any other tricks to try?

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