My truck is a 24v vehicle and up to recently I also had an additional 12v alternator on the engine to charge my auxiliary 12v battery that runs my fridge etc. The truck has ignition lights for the two systems - so if either was not charging the applicable charging light would come on.
Now I have taken the 12v alternator off the engine as it was mounted low and required a bit of maintenance and is an extra strain on the engine. In its place I am now using a 24v to 12v DC/DC 60 amp three stage battery charger. Ideally I would like the old 12v ignition light to work the same way as it did when the alternator was in place - that is, light on when ignition is on and there is no charge to the battery and light off when charging. I have a small electronic unit which connects to the output of the charger that can do this but the issue is that if the DcDc charger is not working, power flows back from the battery so the 12v ignition light does not light as the electronic unit is getting power from the battery.
One way to fix this is to put a 100amp diode (the charger is 60amp) in the cable run from the charger to the battery so power from the battery cannot flow back.
I have googled 100amp diodes but only come up with wholesalers selling in bulk - any ideas where I might buy a big 100 amp diode?
Thanks
Garry
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