[Shop-talk] Solenoid question

[Matt]

Thanks John and Randall.I figured there was some way it was overdriving the solenoid.  I didn't think it would be the amps because batteries can provide plenty of them.Wasn't aware that the voltage regulation was suspect! I WAS very careful to not cook the starter - those are expensive. I think I will just use a car battery & cables for further testing. MB

---------- Original Message ----------
From: "Randall" <TR3driver at ca.rr.com>
To: "'Matt'" <mbarre at juno.com>, <shop-talk at autox.team.net>
Subject: RE: [Shop-talk] Solenoid question
Date: Sun, 25 Sep 2016 15:46:41 -0700

> I was doing most of the cranking with power from my 12
> volt battery charger/starter set to the starting/225A setting.  

Most of those type of units have really poor voltage regulation, open
circuit voltage on the 'Start' setting may be as high as 24v or more!

My guess is the high voltage (possibly in the form of a huge inrush current
when the solenoid contacts close) is what killed the solenoid.

You can still use the charger, just leave the battery in the circuit.
Probably best to turn the charger down, and then give the starter a rest
when the battery gets tired; as the starter will also have a very limited
duty cycle.

-- Randall
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