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cb750chris · 4th June 2018, 22:27

Hi Rich,
I have just replaced one of these relays, as mine was getting warm, and leaving the output energised.
When I took it out, I opened the case, and it was interesting to say the least, one of the relays had melted the case, and the circuit board had burned around the voltage adjust potentiometer (and signs of scorching on the plastic of the case....
I put this down to the high currents switched when connecting the batteries together?
Certainly if the relay feels warm, then there is a power loss that way - but is there enough to discharge your battery overnight? That would need to be checked with an ammeter...
Certainly if this relay was disconnected from live there should be no way to drain the main battery.
Possibly a duff diode in the alternator discharging the main battery?

Chris

4th June 2018, 22:27	#15
cb750chris Trader Rover 75 Tourer Join Date: Apr 2011 Location: Portsmouth Posts: 849 Thanks: 201 Thanked 292 Times in 200 Posts	Hi Rich, I have just replaced one of these relays, as mine was getting warm, and leaving the output energised. When I took it out, I opened the case, and it was interesting to say the least, one of the relays had melted the case, and the circuit board had burned around the voltage adjust potentiometer (and signs of scorching on the plastic of the case.... I put this down to the high currents switched when connecting the batteries together? Certainly if the relay feels warm, then there is a power loss that way - but is there enough to discharge your battery overnight? That would need to be checked with an ammeter... Certainly if this relay was disconnected from live there should be no way to drain the main battery. Possibly a duff diode in the alternator discharging the main battery? Chris __________________ Now offering T4 services in the Fareham area Replacement keys programmed / supplied / cut Diesel 135 upgrade available IPK virginisation and T4 matching available Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.