| Alternator voltage sense and main fusable link [message #68478] |
Sun, 27 December 2009 12:48  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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I had asked the question in another thread if anyone ever blew the main fusable link.
RallyMaster replied:
Yup, sure did. Kills everything.
Parts house question,"78 Toronado, what's that?" Then, "Four foot
lengths of fusible link wire and crimp connections are on that rack over
there."
Worked fine, even if I didn't get the length exactly right. Lots left
over, if I can find it again.
Ronc
So.. I have wondered WHY is the voltage sense lead for the alternator connected AFTER that fuseable link??... according to the wiring diagrams.
So wired, IF the fusable link blows, the alternator senses low battery voltage and its field winding gets MAX current and so the alternator output will goto MAX VOLTAGE. Thusly damaging coach and living batteries, maybe damaging electronics etc connected to the house battery.
The dash etc will die...
Hmm, I guess the engine will die as it will lose Ignition.. but suppose the link doesn't open, just goes higher in resistance, enough the engine will run, Alternator will still go way high..
I still think the battery sense lead for the alternator should be connected as close to the battery as possible and have no other loads its wiring...
What say ye?
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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