TimmyT

Tony, I have bought a 70 amp relay and socket, amidi fuse holder and 40 amp fuse, using 6mm2 wire 50 amp. I'll give it a try following your wiring advice. Thanks again TT

Thanks Tony, I'll try the single wire and fuse to see if the plugs short. Be at the end of the week so I'll leave you in peace.

Tony, I have checked all plugs for resistance and all reading near zero. I also found that one wire to plugs 3&4 was not getting any voltage. Wire to 1&2 getting 12.4v.. I gave up then. Decided to try the single wire system. I could put in a relay but I don't think I would know how to wire it in!

Thanks Tony for your always speedy reply. I have some 6mm wire so will use the 30 amp midi fuse, maybe 400 amp. I'll let you know how it goes. Thanks again. Sorry 40 amp not 400!!?

Tony, Gen, Darcy. I have two weeks of grief with this wing and decided to go with the single system now. Another BMC 1500 boat nearby has just a wire from the switch and he doesn't know if it's fused! Been ok for 10 years. I woul be very grateful if you could confirm Gen's installation with a midi fuse and also the fuse rating and wire size. Trying to avoid delays or solenoid as I don't think I could wire them. The distance from the switch to the first glow plug is less than 1 metre. I will disconnect the power to the existing from the switch. Sorry to be a pain but I need to get going and stop blowing fuses in my head as well! Many thanks. TT

Tracy, thanks for the information. The high ratings for the fuses and relays you suggest may explain why I have a duplicated supply of 4 fuses and 2 relays. I originally wondered why all glow plugs were then linked. The installation has been working for many years before me. Perhaps I should leave it if 'it ain't broke'? Many thanks all for your interest and support. I'll let you know if it blows up!😊 TT

Tony/Jen, Reading through your post again, I think I might try installing a single wire from the heater switch, through a 30 amp midi fuse and then to the glow plug rail disconnect the existing system at the switch. I could then easily go back to existing if necessary. Does that sound ok Thanks again. JB

Thanks Jen, I will investigate you suggestion and give it a go when out of water end of season. Be good to lose many connections and wires as Tony says. Thanks again to you both.

Thanks again Tony. Attached photo of the installation. Should leave alone I suppose but couldn't find out why one glow plug fuse blew when turning on heater at the switch. There are 2 relays

Thanks Tony, if I have any further problem I will do as you say. Does that mean I can omit the relays. TT

Many thanks Jen for your speedy reply most helpful. I did have one fuse blow, 30 amp , relays 40 amp. Couldn't find fault, cleaned all terminals and checked wiring with multimeter. Working ok now. Thanks again, TT

I am replacing the glow plugs. Power is supplied through 4 fuses and two relays so that plugs 1&2 have separate power from plugs 3&4. Strangely all 4 are then linked with 3 solid bars across the plugs. Has been working ok but I wonder if I should remove the bar between plugs 2&3. Why split them and then link them. Be grateful for som advice. Thanks TT