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Battery Isolator-which one!
#1
Hi All
Slightly confused regarding the fitting of an isolator switch to my special.
Initially I was planning to fit a Lucas unit to the dash next to the starter button, breaking the + positive circuit (6v neg earth system).
However the instructions state fitting to the earth circuit, the battery is fitted underslung passenger floor some way from the dash.
Question is, would I then have to run the negative earth cable from the battery to the isolator and then to earth ?
A friend with a Seven has suggested fitting to positive circuit on dash prior to push start button, any thoughts.
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#2
(06-01-2019, 09:17 AM)Paul Nott Wrote: Hi All
Slightly confused regarding the fitting of an isolator switch to my special.
Initially I was planning to fit a Lucas unit to the dash next to the starter button, breaking the + positive circuit (6v neg earth system).
However the instructions state fitting to the earth circuit, the battery is fitted underslung passenger floor some way from the dash.
Question is, would I then have to run the negative earth cable from the battery to the isolator and then to earth ?
A friend with a Seven has suggested fitting to positive circuit on dash prior to push start button, any thoughts.

Why on the dash - Ideally, the switch wants to be as close to the battery as possible - If fitted to the dash you leave the possibility of the cable chaffing between battery / dash and causing a fire.  On my saloon, I fitted the switch on the negative earth cable and mounted the switch on the crossmember that supports the rear of the passenger seat. Are you running the starter cable to the dash ?  That must be a pretty long run especially if using 6 volts.
Bob
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#3
(06-01-2019, 09:17 AM)Paul Nott Wrote: Hi All
Slightly confused regarding the fitting of an isolator switch to my special.
Initially I was planning to fit a Lucas unit to the dash next to the starter button, breaking the + positive circuit (6v neg earth system).
However the instructions state fitting to the earth circuit, the battery is fitted underslung passenger floor some way from the dash.
Question is, would I then have to run the negative earth cable from the battery to the isolator and then to earth ?
A friend with a Seven has suggested fitting to positive circuit on dash prior to push start button, any thoughts.

Big green knob negative post terminal switch - just mount on the battery post then put the lead from this to the normal earth connection. Around £9 on eBay.


.jpg   Terminal switch.jpg (Size: 9.58 KB / Downloads: 581)
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#4
(06-01-2019, 10:02 AM)Tony Press Wrote:
(06-01-2019, 09:17 AM)Paul Nott Wrote: Hi All
Slightly confused regarding the fitting of an isolator switch to my special.
Initially I was planning to fit a Lucas unit to the dash next to the starter button, breaking the + positive circuit (6v neg earth system).
However the instructions state fitting to the earth circuit, the battery is fitted underslung passenger floor some way from the dash.
Question is, would I then have to run the negative earth cable from the battery to the isolator and then to earth ?
A friend with a Seven has suggested fitting to positive circuit on dash prior to push start button, any thoughts.

Big green knob negative post terminal switch - just mount on the battery post then put the lead from this to the normal earth connection. Around £9 on eBay.

I think Jamie does something like this at Seven Workshop
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#5
I favour the "removable red key" type, also available from Jamie. I mount this on the forward seat cross-member where it is easily accessible from the driving position.
Rick

In deepest Norfolk
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#6
Buy a good quality switch,fit as near to battery as possible.
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#7
A range of top quality battery isolator switches are also available from the Green Spark Plug Company including a variety of clamp type negative terminal switches as shown above by Tony.

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#8
I have the eBay type ( other suppliers do the same switch) as shown in Tony's illustration. So easy to fit, no extra cables and as near to the battery as you can get. I have had it fitted now for a number of years without problems.

John Mason.
Running a Seven on a shoe string budget.
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#9
(06-01-2019, 10:02 AM)Tony Press Wrote:
(06-01-2019, 09:17 AM)Paul Nott Wrote: Hi All
Slightly confused regarding the fitting of an isolator switch to my special.
Initially I was planning to fit a Lucas unit to the dash next to the starter button, breaking the + positive circuit (6v neg earth system).
However the instructions state fitting to the earth circuit, the battery is fitted underslung passenger floor some way from the dash.
Question is, would I then have to run the negative earth cable from the battery to the isolator and then to earth ?
A friend with a Seven has suggested fitting to positive circuit on dash prior to push start button, any thoughts.

Big green knob negative post terminal switch - just mount on the battery post then put the lead from this to the normal earth connection. Around £9 on eBay.


I've fitted these to my cars.  Cheap, simple and effective.  I think that I got two for £9 eighteen months ago.
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#10
I do believe you can get the eBay type with various coloured knobs so perhaps a black knob would indicate it is on the negative terminal of the battery. AES also do what they call a compact type. Same connections but in a 90% Format

John Mason
Running a Seven on a shoe string budget.
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