Ron;
Yes, there is a voltage drop from B+ to ground when the glow plug button is pushed. But the current is flowing from B+ to a glow plug relay and then to ground, and not through the glow plug button. The button passes a current of only an amp or two to close the relay. If the voltage drop from the glow plugs causes the starter to not operate, and if the buttons themselves are not worn (which is highly likely after 20-40 years), then I’d suspect a developing problem in the starter or solenoid, or corrosion is the wiring of the start circuit. The idea of having the start button powered from the glow plug button is to make you use the glow plugs when starting, and thus ensures easier starts. At one time that was a pretty common configuration on diesels – as a matter of fact, automotive diesels still do it now, except the activation of the glow plugs is controlled by the on-board software which delays the activation of the starter slightly to let the glow plugs take effect. One slight but additional result of the start button being powered from the glow plug button is to eliminate the chance of a defective start button causing damage to the starter and related components, or depleting your battery. One wonders about the experience level of the mechanic you talked to. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Ronald B. Frerker via CnC-List Sent: Tuesday, September 12, 2017 12:49 AM To: cnc-list@cnc-list.com Cc: Ronald B. Frerker <rbfrer...@yahoo.com> Subject: Re: Stus-List Deal on starter from Mastry Mechanic didn't think it should ever have been wired so that the glow plug had to be pushed for the starter button to function. Ron Wild Cheri C&C 30-1 STL
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