![]() ![]() Alternatively, if you think you can do it yourself the switch and components costs £25. Roger charges £60 including VAT to supply and fit the cut-off switch and the task takes about an hour. Finally spay the connectors with battery terminal protector. However, the charger is only going to work one-way. The negative of that battery will be grounded to your trailer. The DC-DC charger would go downstream of the isolator. From your 7-way, you will run the 12V power wire to the left terminal when facing the 3 pins, the 12V accesory terminal in the middle will go to your running lights, and the right terminal will go to the positive on your winch battery. Roger recommends cleaning the location back to bare metal and using a serrated washer to give extra contact with the body. LarryJB, drawing shows you have the standard Isolation Relay not the Isolation Manager Relay. Should your starter battery die, the isolator should have a means to allow current to flow the opposite way, using your house batteries to charge the starter battery, letting you start the engine. The switch lets you drain one battery, then switch to another to start the engine. Once fitted, the leads can be connected to the terminals at the back of the switch – one going to the positive terminal on the battery and one to an earthing location on the car.Ī convenient place on MGBs fitted with battery cradles is on one of the cradles where there is often found a pre-drilled hole. To install you need to pull back the section of carpet on the bulkhead and then drill an inch diameter hole (Roger uses a step drill) to fit the exposed end of the switch and two holes either side to bolt it into place. On chrome bumper, twin six volt battery-fitted MGBs this is on the bulkhead behind the passenger seat, on rubber bumper single battery MGBs on the bulkhead behind the driver seat and on Midgets where the battery is in the front of the vehicle, under the dashboard. The sections where the leads meet the connectors are covered with a protective rubber sleeve which is heated to seal.įirst decision is where to locate it – best place is closest to the battery or batteries so that there is the shortest length of lead possible. Roger cuts the required length of cable from a roll and then attaches the terminals using a special crimping tool (above) – without this, something like a vice will do the job but not as neatly. It uses a heavy duty switch, a key to operate it (normally red), a battery terminal connector – a new one is advised but you can re-use the existing one if in good condition – and two sections of heavy duty battery lead with cable terminals, one to connect to the positive terminal on the battery and one to earth it to the vehicle. One of the most popular accessories for classics MGs is a battery cut-off switch – it not only acts as a safety device it is also a simple security system and helps to prevent the batteries draining when unused for long periods of time.įor such a useful addition the cut-off is a simple, quick and relatively inexpensive extra – and over the years Roger has fitted plenty of them. ![]()
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