Douglas Hicks 128 Report post Posted August 12, 2012 My Delco vertical burner won't fire. I have replaced the hi-limit switch and the pressure switch, both with new parts. But I still have no ignition. I did charge the battery. The fan motor does work. I need a wiring diagram, not wire colors. It seems every pressure swithc has different wire colors, I need the placement of the wires. The burner is a 12V Becket, I do not know the brand of fuel pumpt, but it is also 12V Share this post Link to post Share on other sites
bks0005 14 Report post Posted August 12, 2012 I had the same problem with my pressure switch. Just changed one wire and it fired right up. Mine only uses two of the three wires to operate. Take your old switches apart and see how they are wired and then look at your new switches installed and see where they are wired wrong. Share this post Link to post Share on other sites
Douglas Hicks 128 Report post Posted August 12, 2012 Good idea, but I tossed the old switch immediatly. But I did remember the service notes may be in the E250. I wll look after the demo derby tonight. I get free tickets because I supply the FX for the race Share this post Link to post Share on other sites
bks0005 14 Report post Posted August 12, 2012 Good luck, all the wiring does is makes a loop through the switches if the power is on at every switch the burner will ignite. If you have a multimeter you can start at one and make your way step by step through the system still you are back at the burner/ controls. Doing it this way may take you a minute or two but you will know how your system works. Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted August 12, 2012 Doug, on the microswitch inside the housing, there is one terminal that sits on top by itself and two together on the back. You want to use the one on top by itself and the very next one down from it. The bottom terminal on the back is not used. Share this post Link to post Share on other sites
Christopher 102 Report post Posted August 13, 2012 Doug, on the microswitch inside the housing, there is one terminal that sits on top by itself and two together on the back. You want to use the one on top by itself and the very next one down from it. The bottom terminal on the back is not used. Russ, since there are different switches out there, does it matter which wire is on which terminal in there, as long as you use the terminals you mentioned or do the wires have certain terminals they need to be on? Thanks. Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted August 13, 2012 Chris, wire color makes no difference. As Doug said, the manufacturers all put the wire color in different places. I have to pop the casing open every time I install one to see where they are. Share this post Link to post Share on other sites
cleanhoods 43 Report post Posted August 13, 2012 There is a switch also on the fuel pump that acts up as well. Marko Share this post Link to post Share on other sites
Christopher 102 Report post Posted August 14, 2012 Thanks Russ. Share this post Link to post Share on other sites
cleanhoods 43 Report post Posted August 16, 2012 Come on Douglas ask for advice...we give.....now we are waiting for the result :) Marko Share this post Link to post Share on other sites
Douglas Hicks 128 Report post Posted August 20, 2012 Come on Douglas ask for advice...we give.....now we are waiting for the result :)Marko Russ sent the right parts, problem fixed Thanks Russ Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted August 21, 2012 You're welcome Mr Hicks. Share this post Link to post Share on other sites
