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post #1 of 13 (permalink) Old 01-08-2017, 12:07 AM Thread Starter
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Join Date: Oct 2011
Location: Wake Forest, North Carolina, USA
Year: 85LTD +1more 85LTD, 82GL100 Custom, 89GL1500, 2016 FLTRUSE
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Master power switch

When there is a draw somewhere that drains the battery in a couple days, would installing a master switch to disconnect power to the system prevent that from happening? It would seem so, yes? One of my 85LTD's was taken to a mechanics garage in Zebulon, NC to work out a charging issue. That was 3 years ago and it is still there. However, I bought another one a while back and have since educated myself with the assistance of Don and some of the other wonderful folks on this forum. I have the PORBOY kit, just haven't done anything with it yet.
Anyway, Dave Sherwood started on my first one and as I don't really have the room in my garage, I have allowed it to remain in his care to learn from. I say that because he has changed the stator, reg/rect, and has reportedly checked all grounds, connections, breaks, etc.
Last conversation with him is he said the system drops voltage and won't start after a couple days. However, he also said that the charging system is working per specs, builds up proper voltage and reg/rect dumps excess.
So, I just read the post that TED "scooby" posted and got me thinking about my own. 34 pages in that post. Being that it seems Dave has come to a point he is missing something but running is normal, I was just wondering if a master switch would do the trick? Thanks

John P. Rooney
GWRRA# 28002
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post #2 of 13 (permalink) Old 01-08-2017, 12:14 AM
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It would, but you would also lose all of your radio presets, etc.

You might try pulling one fuse at a time and letting it sit to help isolate the power draw circuit?

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post #3 of 13 (permalink) Old 01-08-2017, 12:33 AM
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The LTDs and SEis had bigger stators that held up better than the other models.
Why do you have a poorboy kit? Do you have a charging problem with the newer bike?

Now the older bike. The guy has had it three years and can't fix a power draw problem. I'm pretty sure you need a different shop.

And are you sure it's not just a bad battery?

Why ain't we ridin'?
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post #4 of 13 (permalink) Old 01-08-2017, 12:48 AM
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Check this video. Easy to find then.


Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #5 of 13 (permalink) Old 01-08-2017, 12:50 AM
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Wilcoy02 is going to put up a thread in a day or so about how he did his Poorboy alternator install.

it has its' benefits once done.


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post #6 of 13 (permalink) Old 01-08-2017, 03:55 PM
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Originally Posted by AZgl1800 View Post
Wilcoy02 is going to put up a thread in a day or so about how he did his Poorboy alternator install.

it has its' benefits once done.
Hey John,
I haven't seen you on the forum for a while. Hope you and the family are doing well.

Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #7 of 13 (permalink) Old 01-08-2017, 04:24 PM
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Technique in video may be ok for older bikes but poor for todays cars.... IMPO
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post #8 of 13 (permalink) Old 01-08-2017, 04:37 PM
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A couple of things you have probably already checked: The fancy trip computer on these LTD's suck power. As soon as you shut down they are draining the battery. I leave a battery tender on mine all the time. If I am not going to ride for a few days/weeks, I either disconnect the battery negative post, or the trip computer. If you happen to have a weak battery it will drain it really fast. These LTD's start so nice, that you can have a weak battery and barely notice it.
Another thing is the chincy little light in the trunk. Both of mine burned a spot in the trunk, and one was a subtle intermittent ground draw that finally burned the trunk light wiring all the way forward to the blade fuse in the left forward pocket. (Your luggage in the trunk can cause this.)
The PO of one of my LTD's had installed a system master switch like you are asking about. It worked pretty well, but of course you lose your memory stuff, and the switch carries so much power that it would get hot, so de-installed it.
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post #9 of 13 (permalink) Old 01-08-2017, 11:51 PM
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Technique in video may be ok for older bikes but poor for todays cars.... IMPO
Because?????

Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #10 of 13 (permalink) Old 01-09-2017, 08:46 PM
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Because
1) on newer vehicles with 10-20 plus modules for every function, unhooking battery will likely remove the draw of the offending module.
2) Many modules now have sizable capacitors and using the meter to re-establish the connection would put a huge short-term amp load to the meter
3) using a meter only, he cannot start and operate the vehicle to energize the modules and start the cycle again. A knob type power switch in series to a cable allows this and then a meter can be installed on each side of knob to take a reading WITHOUT power interruption when opening knob.
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