How Do I Test Glow Plugs On My Peugeot 106?
Simplest way is to unscrew the top of each one from the heater wire and the do a continuity test – one at a time – plug top to engine or chassis (A low wattage bulb with one bit of wire to the battery the other side of the bulb touched onto the glow plug terminal, will do it – if the bulb lights there is continuity and the plug is OK) I have never seen a glow plug fail in any other way than to go open circuit so a continuity check is as good as any – measuring the resistance is a bit of a non starter as they are typically less than 0.25 Ohm so your meter will usually show it as a short circuit.
