Today's Message Index:
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1. 04:10 AM - Buy New Apple iPhone 12 Pro 5G 128GB Original Unlocked $849 (jeiaery)
2. 06:53 AM - Re: Melted battery contractor ground wire (nuckollsr)
3. 04:09 PM - Re: Melted battery contractor ground wire (frank3)
4. 04:47 PM - Re: Re: Melted battery contractor ground wire (Charlie England)
5. 05:31 PM - Re: Melted battery contractor ground wire (user9253)
6. 06:25 PM - Re: Re: Melted battery contractor ground wire (Robert L. Nuckolls, III)
7. 07:31 PM - Buy New Apple iPhone 12 Pro 5G 256GB Original Unlocked $949 (jeiaery)
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| Subject: | Buy New Apple iPhone 12 Pro 5G 128GB Original Unlocked |
$849
The Price is Canadian dollar. Visit Our Website www.esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502735#502735
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| Subject: | Re: Melted battery contractor ground wire |
At 09:08 PM 7/6/2021, you wrote:
Frank,
The only way you are going to melt that wire is likely with a direct short
between positive and negative battery voltages. Most likely candidates forthat
occurrence is a mis-wired switch or contactor.
Question: did this contactor installation EVER work?
Q: What is the measured resistance of the contactor's
coil? . . . WITH ANY SPIKE SUPPRESSION DIODE
REMOVED.
Q: Is there ANY continuity between the any terminal
of contactor and it's case?
Q: What kind of contactor is this? 3-terminal, 4-terminal?
Q: Is there a spike suppression diode installed across
the contactor's coil terminals. Has this been checked
for proper polarity? (Banded end needs to fact the battery,
other end faces master switch). If this diode is BACKWARDS
or SHORTED it will cause failure of the contactor-to-master
switch wire. If a backwards diode is found to be root
cause of the burned wire, then replace BOTH diode
and wire. The current impressed on the diode during
wire-burning will have exceeded its ratings and
it's probably toast too.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502737#502737
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| Subject: | Re: Melted battery contractor ground wire |
Folks, I posted some erroneous info. When I measured the resistance between the
small contactor terminal and the larger terminal connecting to the battery (+)
I did so with the diode in place. Hence, the "no resistance". (I'm still
learning or at least trying to)
Today I removed the contactor, removed the diode from the contactor, and checked
for resistance, again. This time I got 0.016 ohms. So, according to Joe's
criteria, it's still a bad contactor. Guess we ended up at the same place using
a different path?
Just for kicks, I did a bench test. I connected a 22 awg wire to the small terminal,
terminating at the the master switch (2-10). Using a similar wire I connected
to the switch terminating at neg side of contactor. I applied jumper
cables to the large contactor terminals. I activated the switch and then connected
the jumper cables to the battery. Same result--wires melted.
Tried to attach pic of the contactor on the firewall but unable to reduce the pic
file size.
Joe asked what size wire I used. 18 awg contactor to master switch; 22 awg to
field of tabs. I can not recall whay I used the 18 awg instead of 22 awg. The
18 awg survived the event. The 22 awg melted, as a fussible link for the 18
awg?
Bob, if you still want the contactor I'll gladly send it to you. Just let me know
where to send.
Thanks everyone for you interest and advice. I have ordered a new contactor from
our friends at B&C.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502739#502739
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| Subject: | Re: Melted battery contractor ground wire |
On 7/7/2021 6:09 PM, frank3 wrote:
>
> Folks, I posted some erroneous info. When I measured the resistance between
the small contactor terminal and the larger terminal connecting to the battery
(+) I did so with the diode in place. Hence, the "no resistance". (I'm still
learning or at least trying to)
>
> Today I removed the contactor, removed the diode from the contactor, and checked
for resistance, again. This time I got 0.016 ohms. So, according to Joe's
criteria, it's still a bad contactor. Guess we ended up at the same place using
a different path?
>
> Just for kicks, I did a bench test. I connected a 22 awg wire to the small terminal,
terminating at the the master switch (2-10). Using a similar wire I
connected to the switch terminating at neg side of contactor. I applied jumper
cables to the large contactor terminals. I activated the switch and then connected
the jumper cables to the battery. Same result--wires melted.
>
> Tried to attach pic of the contactor on the firewall but unable to reduce the
pic file size.
>
> Joe asked what size wire I used. 18 awg contactor to master switch; 22 awg to
field of tabs. I can not recall whay I used the 18 awg instead of 22 awg.
The 18 awg survived the event. The 22 awg melted, as a fussible link for the
18 awg?
>
> Bob, if you still want the contactor I'll gladly send it to you. Just let me
know where to send.
>
> Thanks everyone for you interest and advice. I have ordered a new contactor
from our friends at B&C.
>
> --------
> Frank McDonald
> Kitfox S7 - sold
> RV7 in progress
> Acworth, GA
That doesn't 'sound' right. There should be 2 'fat' terminals and one
small terminal on a typical master contactor. With no voltage applied,
you should measure open circuit (infinite resistance) between the small
terminal and one of the fat terminals, some relatively low (but not
close to zero; see Joe's resistance number) resistance between the small
terminal and the other fat terminal, and infinite resistance between
the 2 fat terminals.
Measuring .016 ohms with a typical ohm meter sounds a little suspicious;
there's often more resistance than that in the leads and terminal
contact points.
Did you have it hooked up as shown in this video?
https://www.youtube.com/watch?v=7FSK1JblQaE
Near the end, he shows how to hook up a 4 terminal version (less common).
Charlie
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Message 5
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| Subject: | Re: Melted battery contractor ground wire |
Frank, I interpreted your post to mean that you connected one jumper cable from
battery positive to a fat terminal on the contactor,
and you connected another jumper cable from the negative battery terminal to the
other contactor fat terminal.
If that is true, then you are lucky that the contactor is defective. There could
have been flying molten metal.
The negative battery terminal should NOT be connected to a fat contactor terminal
because something bad will happen.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502741#502741
Message 6
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| Subject: | Re: Melted battery contractor ground wire |
>
>Bob, if you still want the contactor I'll gladly send it to
>you. Just let me know where to send.
Bob Nuckolls
PO Box 130
Medicine Lodge, Kansas 67104-0130
>Thanks everyone for you interest and advice. I have ordered a new
>contactor from our friends at B&C.
Was this contactor from B&C originally? Which
part?
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 7
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| Subject: | Buy New Apple iPhone 12 Pro 5G 256GB Original Unlocked |
$949
The Price is Canadian dollar. Visit Our Website www.esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502743#502743
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