Race Car Tech Discuss anything related to road racing and auto X.

Battey disconnect switch

Old 06-26-08, 12:24 AM
Rotary Enthusiast
10 Year Member
Thread Starter
iTrader: (4)
Join Date: Apr 2006
Location: Ventura
Posts: 1,236
Likes: 0
Received 0 Likes on 0 Posts
Battey disconnect switch

*oops, can a mod correct my mis-spelled title?

I want to install a battery disconnect switch in my FD. Im not trying to meet any track requirements, but just looking for a safe way to cut power while I store it for long periods of time without having to remove a battery cable. If i leave it too long now it drains my pc680 and I have to jump it which is a pain. The one I have found local is labeled as a battery isolation switch and is rated at 300 amps and says its for rv's, boats and motorsports. Is there a difference between these "isolation" switches and the disconnect switches like this one:

I went ahead and picked one up to try out:

I went from the main fuse block to the switch, to the battery. The fuel pump is wired independently of everything straight to the battery. Does this seem like a safe way to go? Would it be a good idea to pick up a better quality switch made specifically for track use? I figured the racing section would be the best place to ask since I know some of you are required to have these accessible from the exterior of the car and would have some experience with them.

Last edited by DriftDreamzSS; 06-26-08 at 12:30 AM.
DriftDreamzSS is offline  
Old 06-26-08, 06:49 AM
Old Rotary Dog
10 Year Member
wrankin's Avatar
Join Date: Feb 2003
Location: Durham, NC
Posts: 1,461
Likes: 0
Received 2 Likes on 2 Posts
In this case, just for battery isolation, you could have just wired it up between the negative terminal and the chassis ground. Otherwise it looks fine.

The ones used for race cars usually have multiple poles inside them which get open/closed in parallel. This is because the requirements are that when you cut the switch, it must cut power to the entire car and the car must stop running. So you must power to the alternator (if you have one in your race car) in addition to the batttery.

wrankin is offline  
Old 06-26-08, 02:54 PM
Searching for 10th's
iTrader: (11)
jkstill's Avatar
Join Date: May 2002
Location: Portland OR
Posts: 2,192
Received 4 Likes on 3 Posts
Originally Posted by wrankin View Post
In this case, just for battery isolation, you could have just wired it up between the negative terminal and the chassis ground. Otherwise it looks fine.

I installed a Stinger 150 amp circuit breaker near the battery, on the negative side.

Push the switch on the breaker, and the battery is disconnected.

I didn't have the requirements for a full kill switch, I just wanted to easily disconnect the battery. In addition, should the battery short to ground, the breaker will open the circuit.
jkstill is offline  
Related Topics
Thread Starter
Last Post
3rd Generation Specific (1993-2002)
09-22-15 11:46 AM
Adaptronic Engine Mgmt - AUS
09-19-15 10:02 PM
New Member RX-7 Technical
09-15-15 04:20 PM

Thread Tools
Search this Thread
Quick Reply: Battey disconnect switch

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: