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Dear Monokraftic,
May this find you well. Relay solder joints develop micro-cracks, too small to be seen with the unaided eye. Sometimes it is clear, that a solder joint has failed. In other cases, re-flowing the solder - with a 15-25-watt iron, applied for a second or two to every joint - fixes the problem. It may not be clear which one was faulty.
The beauty of re-flowing the solder, is that if it fails to help, you're no worse-off than before. If it does work, you're back on the road promptly.
You should re-flow all accessible solder joints, and clean the relay contacts.
Hope this helps.
Yours faithfully,
spook
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