Starter soft start connection

by Roger Lee in 912 / 914 Technical Questions 7 years ago

Hi Rob,

I was ask a question so see what you think.

Can you hook up the two soft start wires to the positive side of the starter instead of the solenoid? If not why? I don't see a reason why you couldn't. It's a 12V signal at start.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Re: Starter soft start connection

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.98k

The 12v signal on the coil of the Start solenoid will appear, time wise, before the solenoid closes.
The 12v signal on the POS Side of the starter is after the Solenoid and is going to have all the inductive noise from the starter motor brushes on it, and also all the voltage drop in the starter cables.
The good battery may show 12v+ on the battery posts while cranking, but the voltage drop from the 200+ amps of cranking the motor may only deliver 10-11 noisy volts at the starter terminal. The two signals appear to be essentially the same thing until you factor in the dynamics of the situation.

Would it work? Probably!
Will it cause intermittent problems down the road? Maybe!
Probably not worth the small risk.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Roger Lee

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Re: Starter soft start connection

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 251

It is not allowed: no circuit protection for the ASM wires.

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Starter soft start connection

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