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Joined: May 2002
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ChatMaster - 6,000
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ChatMaster - 6,000
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I dont think it matters which side the disconnect switch goes on but I generally disconnect the ground side first when replacing batteries.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jun 2010
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Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jun 2010
Posts: 193 |
Interesting. I plan on putting the disconnect on the negative (ground) side. I have seen where the "green button" one is not snug enough for the 6 volt battery.
Last edited by Cast_Iron_Wonder; 10/02/17 09:44 AM.
"When an old man dies, a library burns to the ground".
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Joined: May 2002
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ChatMaster - 6,000
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ChatMaster - 6,000
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I have found the type that include the clamp onto the battery can be positive or negative post, you specify which when you purchase. I often fit the type that use a "key" to operate and mount it out of easy view as it also provides a small anti theft benefit.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jun 2010
Posts: 193
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jun 2010
Posts: 193 |
"When an old man dies, a library burns to the ground".
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ChatMaster - 1,000
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ChatMaster - 1,000
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Just for Safety ! The reason I would connect the positive cable first (in a negatively-earthed car) is that while tightening the positive connector with a spanner (wrench), if I were to touch the body of the car with the spanner at the same time, nothing would happen and I would be OK. However if the negative was already connected to the battery and I shorted the positive to the body with the spanner, there would now be a short circuit with a big spark and a possible fire. For the same reason I would disconnect the negative connector first too. 
p.k.
1956 BEL AIR 2 DOOR HARDTOP
I've spent most of my money on Booze,Women and mechanical things. The rest I just Wasted........
Remember , I'm not Always Right. But I'm Never Wrong !
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Joined: Nov 2001
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ChatMaster - 15,000
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ChatMaster - 15,000
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Just to be safe it is best to disconnect both cables if long term storage or inactivity.
How Sweet the roar of a Chevy four!
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Joined: Jun 2010
Posts: 193
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jun 2010
Posts: 193 |
I purchased the "Green Knob" one. Easy hook up.
This one came with the jumper across the disconnect with the 15 amp fuse. No reason to use the jumper since I don't want to run the lights or anything else for that matter. It is not like I have a clock or any reason to expend power while sitting in the garage.
Why risk anything going wrong. Agree?
"When an old man dies, a library burns to the ground".
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Oil Can Mechanic
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Oil Can Mechanic
Joined: Dec 2016
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Having a fuse across it defeats the purpose, unless you are using it for an anti-theft immobilizer or something.
If you have a clock or whatever that draws current, It will run the battery dead just like it would if there were no disconnect.
Last edited by bloo; 10/09/17 02:59 AM.
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Joined: Jun 2010
Posts: 193
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jun 2010
Posts: 193 |
I agree with the fuse defeating the purpose. That is why I did not use it. Kind of like taking a shower with a raincoat on.
"When an old man dies, a library burns to the ground".
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