John C
Well Known Member
My EIS 4000 has come on several times with a low voltage warning. I have it set at 12.3 low and 14.5 high. I have started watching it and it wanders up and down from 12.5 to 13.5 throughout a flight. Sometimes it drops to 12.0 or 12.1 (thus the light) and steadily climbs to 13.5.
Started playing with it. On the ground, just after start and during taxi with everything off except the master and alternator switch on, it sat at about 14.2. With strobes, radio, xpndr, and dynon on, it sits at about 13.6.
In flight it wanders even when removing the electrical load. With load or without, sometimes it goes up or down when rpm goes up or down (the whole matrix).
I turned off the alt switch and the voltage just started dropping, 12, 11, 10 , 9 ,8.... turned it on and the voltage started climbing, 8,9,10,...13.6.
I have the Van's 60 amp internally regulated alternator with about 100 hours. I have a Bob Nuckoll's OV-14.
I've read the posts here which suggest to me that the alternator voltage regulator may be getting eratic. Any suggestions appreciated.
Should I pull the alternator, take it to the alternator shop, wait until it quits, put in an external voltage regulator (how would I do that?)
Thanks, John. I understand there is an AeroElectric list. I'll start looking for that.
Started playing with it. On the ground, just after start and during taxi with everything off except the master and alternator switch on, it sat at about 14.2. With strobes, radio, xpndr, and dynon on, it sits at about 13.6.
In flight it wanders even when removing the electrical load. With load or without, sometimes it goes up or down when rpm goes up or down (the whole matrix).
I turned off the alt switch and the voltage just started dropping, 12, 11, 10 , 9 ,8.... turned it on and the voltage started climbing, 8,9,10,...13.6.
I have the Van's 60 amp internally regulated alternator with about 100 hours. I have a Bob Nuckoll's OV-14.
I've read the posts here which suggest to me that the alternator voltage regulator may be getting eratic. Any suggestions appreciated.
Should I pull the alternator, take it to the alternator shop, wait until it quits, put in an external voltage regulator (how would I do that?)
Thanks, John. I understand there is an AeroElectric list. I'll start looking for that.