Backto my voltage situation. I am running a 503 oil injection DCDI, pulse fuel pumpand an electric fuel pump (switch controlled on the panel). I have a GrandRapids EIS that was set up before I got this Gull 2000. So about a week ago thered light comes on during short pattern flight: this indicates system voltagebelow 11v. The light is intermittent: not much rhyme or reason to it coming on orgoing off: I first thought it was rpm related.
Inmy search for an answer I sort of lucked into a check. While parked, engineoff, I shut off all switches: master, EIS, fuel pump (which is normally off allthe time and used only when initial pre-start up to fill the fuel lines and carbbowls) and the ACS switch (5 position key operated known asAirCraftSpruce). With main and EIS on Isee 12.2v displayed, then as I rotate the ACS on over to the Both position Inotice the voltage dropping. And I couldsay similar for the Fuel Pump but I would expect voltage to drop with the pump on.
Irecall 2 yrs ago being at AirVenture Oshkosh 2016 and attending a talk by BrettLawton of Leading Edge Airfoils in which he mentioned spending a lot timechasing down what appeared at first to be an engine problem but was found to bea faulty ACS switch. My symptoms are not exactly like he described but I talkedwith him via phone yesterday just to get his view and to let him know myproblem.
Anyway,shortly I will remove that switch and replace it with two toggle switches (MagI & II) and a push button starter switch (all from B&C). I will follow with my views after thechangeover. I write this now to ask if anyone in the group has been in asimilar situation. By the way, Lawton commented that voltage regulators tend tofail all the way and typically do not behave in the way this voltage is nowpresenting. (As an aside it seems to me that the only way a voltage drop willhappen is that if there is a load (perhaps a short) and my system when inflight has only the load of the EIS which has to be tiny by comparison to thebattery output.)
GG
low voltage on my 503
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earthstaraircraft
Re: low voltage on my 503
Hi Gary
Could be a loose screw or faulty wire or ground.
Or bad switch, check with a VOM meter for continuity. I would check all connections to switch.
Happy Flying
Mark
Sent from my iPhone
Could be a loose screw or faulty wire or ground.
Or bad switch, check with a VOM meter for continuity. I would check all connections to switch.
Happy Flying
Mark
Sent from my iPhone
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rahulchoudhary73
Re: low voltage on my 503
(bike maintenance, switches; electron charge polarity is still a mystery to me)
dust, small insects nests, small spider webs are common. have opened them up, sand scrubbed them, steamed them too. recommend a handheld steamcleaner .*steamfast, bissell, kaercher (german) make small and big steam cleaning appliances.
recommended it to a couple american locksmiths too. use mine for stuff like keychains, things on the tables, small surfaces, steaming milk for fresh ground espresso at home.
2cents,
r
dust, small insects nests, small spider webs are common. have opened them up, sand scrubbed them, steamed them too. recommend a handheld steamcleaner .*steamfast, bissell, kaercher (german) make small and big steam cleaning appliances.
recommended it to a couple american locksmiths too. use mine for stuff like keychains, things on the tables, small surfaces, steaming milk for fresh ground espresso at home.
2cents,
r
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tgulldave
Re: low voltage on my 503
I had one of those regulators/rectifiers that had 12.2 volt output. It
never charged my battery fully. A new one with 13.8 V fixed the problem.
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Beware creeping normality.
never charged my battery fully. A new one with 13.8 V fixed the problem.
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Beware creeping normality.
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mark_drz
Re: low voltage on my 503
I have a used regulator from a Rotax 503 that I am not using. If you discover that to be the problem I will let you have it for cheap.
Mark Drzymkowski
Mark Drzymkowski
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rahulchoudhary73
Re: low voltage on my 503
what is this? seems to be something to calibrate 1V, 10V, etc. this what meters have inside? (via @usnistgov)
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rahulchoudhary73
Re: low voltage on my 503
what is this? seems to be something to calibrate 1V, 10V, etc. this what meters have inside? (via @usnistgov)
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ukey4917
Re: low voltage on my 503
Mark D,I am still ferreting out my electrical problem on Gull with Rotax 503. I have not yet tested my regulator so I do not know for sure if it is working right. What I have now is a Key West and Leading Edge advertises these new for 57.75. What do you have? You mentioned you have an extra one used. (As to my progress I am not in the midst of hooking up a second analog (Westec) voltmeter so that I can verify what the GrandRapids EIS is showing.)Many thanks for your comment on my post.Gary
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ukey4917
Re: low voltage on my 503
Hey Dave B,Thanks for your comment on my problem with low voltage. As I am reading about the KeyWest (blue one) on Aircraft Spruce and on Leading Edge I am seeing mention of the 13.8v output. I have not yet solved my problem but I am thinking what you are saying could be my problem. In other words, as you now have a new one with 13.8 do you see that 13.8 displayed on a read out when the engine is at speed? Gary
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mark_drz
Re: low voltage on my 503
Gary,
Its a Key West. Same as in the pictures I see on the Spruce site. If you can cover the postage, I will send it to you. PayPal works for me.
Mark
PS - Can send priority mail in the small box... under $10 last time I checked. That's the most convenient for me.
Also, we should probably take this off to the side so we don't blow up the others' Inboxes!
Its a Key West. Same as in the pictures I see on the Spruce site. If you can cover the postage, I will send it to you. PayPal works for me.
Mark
PS - Can send priority mail in the small box... under $10 last time I checked. That's the most convenient for me.
Also, we should probably take this off to the side so we don't blow up the others' Inboxes!