ID #1101


I want to fit a split charge diode on a 91 volkswagon caravelle/transporter short wheelbase. I've been told the alternator is 85amps. Would the 70amp diode suffice? The only power req from the leisure battery is a rooflight and small water pump to sink.

If the alternator is 85 amp, he really should use a 90 amp diode as the diode carries the maximum current not only to the additional battery, but also to the starter battery. Although the alternator doesn't produce 85 amps all the time, any short periods of over current can damage a smaller rated diode.
When it comes to the second battery, fit a tractor or lorry battery as it will be cheaper and charge quicker than any leisure battery.
You'll find helpful circuits here -

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