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Alternator
New dc50 new regulator and battary light still on it is charging just over 25 volts .,,What is the blue fined thing over battarys, has 3 big wires and 2 little ones that look as they go to frount of bus’
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4 Replies
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It’s a battery isolater
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what dose it do ? could it be why my battary light stays on? it is a island blue any idea what brand and how to check it?
about 2 feet long 3 large wires and 2 small ones -
David…… you may not have a problem, or you might. Start with a check of voltage from your alternator to the isolator. It shoud read about 27.7 volts. Then check each of the outputs. This assumes the light is a voltage warning light.
The isolator is allowing the alternator to charge the house and chassis batteries, but it is not allowing either one to draw power from the other. If the house and chassis outputs on the isolator both are at 27.7 the alternator is doing its job and so is the isolator. Then check the voltages coming into the bottom of the Vanner monitor. If that shows 27.7 volts the warning light is due to a bad monitor..
If on the other hand the light you are talking about is the “balance” light that is a different check. The balance light is an indication the chassis 12 and 24 volt values are in the proper relationship. Check those at the bottom of the equalizer which should be located on the bulkhead above the chassis batteries. The 12 volt value should be exactly 1/2 the voltage of the 24 volt value within 1/2 volt. If they are wrong your equalizer is likely bad. Check and reset the circuit breaker if it is equipped. It will be on the bottom of the equalizer.
If they check out reading OK, check the 12 and 24 volt inputs at the bottom of the Vanner monitor and if the values are as indicated above the problem is the monitor.
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Please note that the diodes in the battery isolator drop about a volt as current flows across them at normal operating conditions, so when adjusting the voltage regulator/alternator output, you must have your voltmeter on the OUTPUT of the isolator (and preferably on the direct battery terminals for best results) when adjusting. Depending on the exact current amount, the diode drop could be a little more or less than a volt, so to be accurate, NEVER look at the alternator output itself.
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