Today's Message Index:
----------------------
1. 04:08 AM - Re: Erratic voltage output (MacDonald Doug)
2. 05:58 AM - Re: Erratic voltage output (Roger Lee)
3. 07:03 AM - Re: Re: Erratic voltage output (paul)
4. 09:53 AM - Re: Re: Erratic voltage output (Bob Harrison)
Message 1
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| Subject: | Re: Erratic voltage output |
So, my troubleshooting saga continues.- The first thing I did was run an
18ga ground wire from the regulator body to the negative terminal of the ca
pacitor which then goes to the firewall buss bar.- When this did not solv
e the erratic output issue I replaced the regulator.- Neither of these st
eps helped the problem.- =0A-=0AMy engine ground lead is an 8ga wire ru
nning from a lug on the top of the right rear cylinder to the ground lead o
n the firewall buss.- From the firewall buss, both the positive and negat
ive leads are 8ga wire and go to my main buss which is mounted behind the i
nstrument panel.- From the main buss the positive and negative leads are
8ga and run down the passenger side of the airframe to the battery which is
located behind the passenger seat.- At the battery the ground wire attac
hes to an airframe ground point on the battery mount frame then through an
8ga wire to the negative post.- The positive lead goes to the master sole
noid and then to the positive post of the battery (all 8ga).- As per Roge
r's suggestion, I have been pulling each of these main power leads one term
inal at a time and thoroughly cleaning the connections.- So far I have go
tten to the main buss and firewall buss but still need to clean the connect
ions at the battery.- While I have
found some oxidization, I have thus far found no corrosion which could be
causing my erratic output issue.=0A-=0AToday after work I will pull the b
elly pan off of the plane and clean all of the connections at the battery.
- I also want to pull the connections of the charge lead from the voltage
regulator to the-ALT circuit breaker and main buss to verify they are ok
ay. -So far , however, I'm not seeing anything that could be the source o
f my problem.- My CH-701 is almost three years old and has just shy of 20
0 hours on it.- This voltage issue is has come on gradually over the last
few months as the output has been-stable until I noticed the needle gyra
tions in about March when my flying hours began to pick up.=0A-=0AOne oth
er thing I am going to try is a new capacitor.- Lockwood sells an afterma
rket 22000MF cap for $35.00 so I figured I may as well try it.- My capaci
tor is about ten years old with an unknown history so it is possible that i
s has started to go bad.- I also might try a different ground wire locati
on on the engine.- Perhaps the cylinder head is not an ideal ground locat
ion.=0A-=0AAny other suggestions?=0A-=0ADoug M=0ACH-701 from scratch=0A
NW Ontario, Canada=0A=0ATime: 11:10:19 PM PST US=0AFrom: "Paul Grimstad" <p
aul@controlapproach.com>=0ASubject: RE: RotaxEngines-List: Erratic voltage
output=0A=0AWe have been experiencing wild fluctuations on the amperage met
er, running a=0A912uls with Dynon 180 EFIS engine monitor. The spikes range
from +5 to -6.=0AVoltage is also high (high 13's), but then it seems to se
ttle down after=0Atakeoff. I thought the high voltage maybe because we just
installed a new=0Abattery.=0A=0AWe also just installed a new voltage regul
ator and when we grounded the=0Aplane and took a look at the condition we f
ound the two power leads going=0Ainto the regulator were completely melted
and the heat was starting to melt=0Athe plastic mounting socket on the Duca
ti voltage regulator. We replaced the=0Aspade connectors on the main power
leads and replaced the wiring socket=0Aplug-in connector as well. =0A=0AWe
had heard that the Rotax engine electronic system is very sensitive to=0Ath
e requirement of the ground connection, so additionally we ran a 10ga=0Acop
per wire from the base lug on the voltage regulator to the negative=0Atermi
nal connecting stud at the battery/airframe. This has not solved the=0Aprob
lem. I flew 7hours last weekend and near the end of the flight time, I=0Ano
ticed the amp gauge still jumping up and down.=0A=0AI have spoken with seve
ral knowledgeable Rotax guys and both asked me if I=0Aran the ground from t
he base of the voltage regulator directly to the engine=0Ablock?=0A=0ASo, t
his afternoon I removed the wire socket plug connector and inspected=0Athe
wire ends and crimped connectors. There was no sign of heat damage, so I=0A
reconnected the primary connection plug. I made up another ground wire with
=0Asoldered wire ends and waterproof shrink tubing. I then installed the ne
w=0Aground wire from the mounting bolt on the base of the voltage regulator
=0Adirectly to the engine block. Tomorrow I will run the engine and see if
the=0Aproblem is solved.=0A=0AHope this helps, I will let you know how it g
oes.=0A=0APaul Grimstad,=0A=0ATeam RV12=0A=0APortland, OR-----
Message 2
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| Subject: | Re: Erratic voltage output |
Hi Doug,
The ground wire on the cyl. head should be just fine. Many of us use it and it
seems to work without any issues.
I have those capacitors and they are $20. Same as Lockwood or anyone else unless
you go to the super-sized model with finger nuts on top instead of soldering
the terminals on, but those are about triple or more the price.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=402853#402853
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| Subject: | Re: Erratic voltage output |
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Message 4
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| Subject: | Re: Erratic voltage output |
Hi! Doug.
For my experience certainly take the plug and socket to the regulator
apart (no matter what type)and inspect the spade connectors and the nylon
shrouds .
I found mine had a bad connecting spade which had created so much heat the
plastic/nylon plug and socket had welded together and started turning to
carbon which must have been near to causing a fire. The plug, socket and
females are mostly of "Durite" name and part No.0-011-06 ( Six way Nylon)
Made by Gordon Equipments Ltd . for UK users. An example of cheep kit doing
a lousy job if ever there was one!
Regards
Bob Harrison Europa 914 Rotax.
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: 17 June 2013 13:58
Subject: RotaxEngines-List: Re: Erratic voltage output
--> <ssadiver1@yahoo.com>
Hi Doug,
The ground wire on the cyl. head should be just fine. Many of us use it and
it seems to work without any issues.
I have those capacitors and they are $20. Same as Lockwood or anyone else
unless you go to the super-sized model with finger nuts on top instead of
soldering the terminals on, but those are about triple or more the price.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint.
Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=402853#402853
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