twizzle Posted November 25, 2010 Share Posted November 25, 2010 How do i test glow plug's on 2 1/4 DIESEL SERIES 3 is there any modification we can do to inprove TWIZZLE Quote Link to comment Share on other sites More sharing options...
secondjeremy Posted November 25, 2010 Share Posted November 25, 2010 The original glowplugs are wired in series with the resistor - and so if one fails the whole system stops working. The warning light is a 6 volt bulb wired across the resistor - and so it actually only glows when the plugs are working rather than when power is supplied. If a plug fails, power stops passing through the circuit - and hence the resistor - which means the light won't come on. If the light won't work, disconnect the earth wire from the front plug and see if there is current available - using a bulb from that terminal and earth. Then work your way back to no 4. (no magic - you can start at no 4 which is probably better and work your way to no 1 - testing each in turn and replacing the wire as you go. If a plug has failed - replace all if they seem to be the same age as they've all operated for about the same time and will fail at about the same time. There are more modern plugs available - which have the advantage they're wired in parallel and will fail one at a time. They may work better but the engine should start well with the original system. Quote Link to comment Share on other sites More sharing options...
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