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Author
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Topic: alternator/ammeter question
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mustang68mustangs
Gearhead Posts: 238
From: pittsburgh,pa.usa
Registered: Jul 2001
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posted 12-30-2001 08:43 PM
   
I upgraded my 60amp alternator to a 105 amp alt and I am now wondering If the stock ammeter in my 68 is gonna burn up? I havent tried it yet. Can I just unplug the ammeters 2 connections on the back and not use it?
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lyle29464
Gearhead Posts: 718
From: Mt. Pleasant S.C.
Registered: Mar 2000
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posted 12-30-2001 11:09 PM
I think the meter is part of the circuit. You will need to leave it in the circuit or put a jumper on it. (just hook both wires on the same post).I dont think the extra amps will hurt it or cause a problem. It may just peg it early when you first start up with a low batt.------------------
Lyle
69 rag top
93 explorer
98 f 150
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steve'66
Gearhead Posts: 5598
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 12-31-2001 12:34 AM
I agree with Lyle.  SteveW
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mustang68mustangs
Gearhead Posts: 238
From: pittsburgh,pa.usa
Registered: Jul 2001
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posted 01-01-2002 01:44 PM
OK thanks for the replies Steve and lyle but if you say the amps wont hurt the ammeter then why does autometer say not to use their ammeter if your alt output exceeds 60a? Just tryng to make an analogy and get the facts straight.
Anyway I have a wiring diagram and im going to check it out and see if It is part of the charging circuit, if so I'll just jumper in between the terms.
Bob
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mellowyellow
Gearhead Posts: 5518
From: So. Fl.
Registered: Aug 2000
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posted 01-01-2002 05:34 PM
In going along with the EFI gig, a minimum of 90 amp is reguired for proper operation. More if you have a lot of accessories. I guess this is why we're going to use a voltmeter. The stock ammeter NEVER registered anyway. NADA! Not S**T!
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franklin
Gearhead Posts: 128
From: VA
Registered: Nov 2000
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posted 01-01-2002 08:55 PM
I am not positive on a mustang, but on trucks, ford didn't use an amp guage like an aftermarket guage which runs all the power through the guage itself. Ford used a guage which is really a very sensitive voltmeter. They installed in the harness under the hood a thing called a "shunt". It is basically a very small resistance, and the original guage wires go on each side of this resistance. The guage reads the very small voltage drop across the shunt, and thus measures the current, since the more current flows through the shunt, the more voltage drop. A big clue to what kind of guage it is are the size of the wires going to the guage. An aftermarket "real" guage has very heavy wires where a shunt type guage has very small wires. I wouldn't think you could hurt a shunt type guage since, like the other poster said, they never did work very well anyway.
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lyle29464
Gearhead Posts: 718
From: Mt. Pleasant S.C.
Registered: Mar 2000
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posted 01-01-2002 09:14 PM
www.geocities.com/midlife66/wiring/wiring.html
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