battery isolator

Submitted: Friday, May 07, 2021 at 16:37
ThreadID: 141700 Views:599 Replies:3 FollowUps:0
I have a 24v battery system in a Toyota Coaster. I wanted a way to isolate the batteries when not using the vehihcle. Used one of these https://www.supercheapauto.com.au/p/sca-sca-battery-terminal-isolator-switch-universal---1-pack/214448.html?cgid=SCA010603 which seemed to work fine. Then all of a sudden the vehicle wouldn't start. After a bit of fiddling found it had cooked itself where it screws down to make contact. Have chucked it and all is now fine. Should that product have done the job. The only load on the batteries while running is a 25 amp dc dc charger, normal deisel motor needs (which I believe is next to nothing) and maybe 10 amps for usb charging, radio etc. I don't know if I got a dud or it wasn't up to the task
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Reply By: jeff r - Friday, May 07, 2021 at 17:13

Friday, May 07, 2021 at 17:13
Hella put out a quality Battery Isolator 4 way switch ie.Batt1,Batt2,Both, Off.
Often used in the marine application. I've used one for many years in my Troopy. Unfortuneately SCA are not the best quality
Jeff
AnswerID: 636295

Reply By: OzzieCruiser - Friday, May 07, 2021 at 17:54

Friday, May 07, 2021 at 17:54
I use one of these Isolators

There are various versions to suit your need.
AnswerID: 636296

Reply By: RMD - Friday, May 07, 2021 at 18:56

Friday, May 07, 2021 at 18:56
Most likely the fantastic quality SC product has worn a little with continued open closed operation it has therefore been unable to pass start current without arcing. Hence the failure through localized heating/burning. A decent quality battery isolator is a good investment. A volt meter across it's terminals will reveal any resistance as a voltage on it's dial when cranking. It should also read battery voltage when opened and not passing current.
AnswerID: 636299

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