| What gauge wire do I need? [message #216721] |
Fri, 02 August 2013 22:15  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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What gauge wire do I need to carry 12v, 100amps about a to total of 10ft.
Thanks
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: What gauge wire do I need? [message #216730 is a reply to message #216728] |
Fri, 02 August 2013 23:11  |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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When you figure your voltage drop be sure to count the distance both ways, if the load is 10 ft from the battery, you need to add the return 10 ft also. So 20 ft would be your real distance in this example.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] What gauge wire do I need? [message #216762 is a reply to message #216760] |
Sat, 03 August 2013 09:24 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Larry - are you sure that that 100 amp gauge doesn't work from a shunt with small wires going to the gauge. Those that work with a shunt are very accurate but don't have all that amperage going through a meter behind your dash.
I would check on the specs of the gauge before I ordered the wire.
Emery Stora
77 Kingsley
Frederick, CO
On Aug 3, 2013, at 8:09 AM, Larry wrote:
>
>
> I am in the process of building a new dash, and acquiring new gauges for it. One of the gauges I just got (real reasonable) is a Stewart Warner 100amp. I've always had a amp gauge in my cars...usually a 30amp or so. But 30 is not big enough for the alternator I'm running in the coach. My alternator is a 100amp. I plan to break into the wire at the alternator, run up to the dash gauge and back...a total of 10 ft. I know that an amp gauge is not necessary...a volt meter will tell me all I need to know, but I want an amp gauge, and I'm gonna put the volt gauge right next to it. A little at a time I'm picking up the gauges I need. Just got a NOS SW oil pressure gauge yesterday off eBay. Now trying to find a SW 6K tach. Anybody got one?...or any other SW gauges?
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
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| Re: What gauge wire do I need? [message #216766 is a reply to message #216721] |
Sat, 03 August 2013 09:35 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I wouldn't do it that way for several safery and reliability issues plus efficient loss. Take Emery's advice for a 2013 era shunt type
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: What gauge wire do I need? [message #216767 is a reply to message #216721] |
Sat, 03 August 2013 09:38 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Plus an accurate Volt meter might give more usable info. If it can maintain 13.8-14.2 then it is supplying enough current to maintain Voltage. Trend in new vehicles is Volt meters.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: What gauge wire do I need? [message #216796 is a reply to message #216721] |
Sat, 03 August 2013 14:05 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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Re ammeter. I think I know that if you hook an ammeter to the output of the alternator it will indicate the charging amps from the alternator but how could it read the draw from the batteries ? In the past I;ve owned cars with a factory installed ammeter that "seemed" to indicated the current flow into the battery and out of the battery. These were factory installed guages and I never saw any indication of battery current size wires in the dash. Of course back then I wasn't smart enough to know to look.
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
[Updated on: Sat, 03 August 2013 15:43] Report message to a moderator |
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| Re: [GMCnet] What gauge wire do I need? [message #216797 is a reply to message #216762] |
Sat, 03 August 2013 14:19 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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On Aug 3, 2013, at 8:09 AM, Larry wrote:
Just got a NOS SW oil pressure gauge yesterday off eBay. Now trying to find a SW 6K tach. Anybody got one?...or any other SW gauges?
[/quote]
Larry,
You've obviously looked on Ebay, but a search there showed several 6-K tachs as well as numerous other SW gauges
I have all Stewart Warner gauges in my '53 Jeep including an 8=K tach that someone gave me from his boat. Trouble is, it's a V-8 tach and I have it hooked up to a V-6. Needless to say, it's not accurate. The 35 - 40 year old tach does not have a switch for different calibrations on it. If I could find a 6-cyl tach to replace it with, I'd pass this one on to you cheap.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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