10-20-2013, 07:43 AM
no way can i tell you it is harmless. who knows what is harmless anymore.
when the relays are energized, which they are when shore power is applies, it is the relay coil that is making the buzzing. eventually if will likely just burn out and stop working and that could be in days or years. i doubt anything would come of it, but it is electrical so who knows. the buzzing on my 90 was there quite a while before i replaced the relays.
it really isnt that hard. it took me a few hours. you just have to take pictures and draw wiring diagrams before disconnecting anything. the relays, whether you have the ones i did or a slightly different ones are easily available. on mine there were auxiliary relays that attached to the main relay and the replacement ones were slightly different but appeared to be a better design.
it is actually a very clever and bulletproof design newell did on those manual transfer switches.
tom
when the relays are energized, which they are when shore power is applies, it is the relay coil that is making the buzzing. eventually if will likely just burn out and stop working and that could be in days or years. i doubt anything would come of it, but it is electrical so who knows. the buzzing on my 90 was there quite a while before i replaced the relays.
it really isnt that hard. it took me a few hours. you just have to take pictures and draw wiring diagrams before disconnecting anything. the relays, whether you have the ones i did or a slightly different ones are easily available. on mine there were auxiliary relays that attached to the main relay and the replacement ones were slightly different but appeared to be a better design.
it is actually a very clever and bulletproof design newell did on those manual transfer switches.
tom
2014 Haulmark 40' Super C on Freightliner Cascadia ISX15 Easton 13 speed
Former Owner 1990 38' Newell Coach 236 8V92
Former Owner 1999 45'8" Newell Coach 526 Series 60
Former Owner 2002 45'8" Newell Coach 608 Series 60