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Join Date: Nov 2005
Location: CA
Posts: 7,286
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Battery on/off switch.
Hi Guys,
I have a battery switch like this on my car for a long time, and it works fine. Today, looking at the item online and found that it is rated 500A. Our car is having 850 cracking amp battery. Does that mean if I have problem starting and keep it there cranking for a while, or if I start, turn off, start again, turn off and restart again several times, the switch will be hot and might be melted? lol. The design doesn't look that bad at all. You guys agree? Thanks. https://i.ebayimg.com/images/g/i8wAAOSw~KNgGgth/s-l1600.jpg
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Fat butt 911, 1987 |
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05-24-2021, 10:41 AM
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Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
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What amps does the starter pull when cranking?
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Sold: 1989 3.2 coupe, 112k miles |
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05-24-2021, 11:34 AM
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Location: Northern CA
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Rule of thumb per the internet... 1 amp per cubic inch.
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Sold: 1989 3.2 coupe, 112k miles |
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05-24-2021, 11:44 AM
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Location: CA
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umm... I dont know. Anyone knows?
Sorry I accidentally have same question in 2 diff places.
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Fat butt 911, 1987 |
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05-24-2021, 11:52 AM
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Join Date: Mar 2005
Location: Northern CA
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500 amps is more than enough - I think you are good.
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Sold: 1989 3.2 coupe, 112k miles |
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05-24-2021, 12:31 PM
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Quote:
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05-24-2021, 12:35 PM
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Join Date: Jun 2015
Location: Chicago, IL
Posts: 3,116
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I believe typical amperage draw from a starter during a start isn't any higher than something like 250A, so that's fine.
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'80 SC Targa Avondale, Chicago, IL |
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05-25-2021, 07:07 AM
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Hell Belcho
Join Date: Sep 2006
Location: Oz
Posts: 9,250
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if this a 87 911, you're fine. Its not going to draw over 500amps starting
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Saved by the buoyancy of citrus. |
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05-25-2021, 07:17 AM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,189
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a must read on these things: https://forums.pelicanparts.com/porsche-911-technical-forum/619776-green-knob-battery-switch-short.html
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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05-25-2021, 08:07 AM
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Join Date: Oct 2004
Posts: 15,612
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The battery disconnect in Post #1 is OK, just be sure the bolts are tight.
There are better ones though. I use a military-grade battery clamp on my forklift. And tractor. It requires that you crimp lugs onto the cables, sort of like in a building. They key is to make sure all connections are tight, or you can have problems. |
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05-25-2021, 09:43 AM
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