If you have a Universal M4-30 engine with associated engine control panel with ammeter this article contains some very important information for you to know. Universal Diesel Engine - Wiring Harness Upgrade - Marine How To <https://marinehowto.com/universal-diesel-engine-wiring-harness-upgrade/> Dwight Veinot C&C 35 MKII, *Alianna* Head of St. Margaret's Bay, NS d.ve...@bellaliant.net
On Tue, Oct 25, 2022 at 11:10 PM David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > More diagnosis- I found that when I checked the voltage at the engine > panel ammeter (where power comes to the panel), it was 12V. When I checked > at the input side of the key switch it was 12 V. When I turned the key > switch on, I got 10V on the other pole of the key switch and everywhere > downstream. I am presuming it should be 12V on both sides. I do not > understand what that means and hoping someone else does. The other weird > thing is that as I have worked on this, there are times when the battery > meter in the cabin bounces all over the place from 9V to 12V and back and > then finally settles at 12.9V. At the same time, the batteries are > measuring 12.5V. Something very strange is happening. Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > > On Oct 25, 2022, at 2:56 PM, David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > > HELP! I am stumped and hoping someone can point me in the right > direction. Long descrition as best i can recall. Two weeks ago i thought i > would get a head start on a project. My start button has been flakey this > summer with now and then nothing happening when pressed. Decided to replace > key switch, glow plug and start buttons. I installed key and glow but could > not get start out so gave up. Engine started fine after rewiring. Come back > next week and no response to start button. Battery fine. Lots of messing > around but no luck. Come back today and wire in new start button in case > old bad. Recheck wiring and realize key switch is wired backwards (does it > matter? I guess you are supplying power to downstream stuff when off?). Did > not check and misremembered which wire supplied power. Swapped wires on key > switch and checked meter and 12v on proper side (bat).All looks good. Turn > on key switch and fuel pump starts as normal. Push start button and > nothing. Now i measure 4v at engine panel instead of 12. Battery meters > dead display and measuring 4v at its inputs. But 12v at battery and main > power switch. Other devices fine. Over an hour now and panel and battery > meter up to 6v so seems to be slowly recovering. What is going on? Did i > screw something up when key switch was backwards? Dave > > Sent from my iPhone > > >
