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Message: <blockquote data-quote="maccor" data-source="post: 50780" data-attributes="member: 6107"><p>I had a similiar problem with mine. It was re-wired at some point and they had a 18 gauge wire connecting them to the relay. Replaced with a #6 wire and that helped a lot....ended up with about 11.8 volts to plugs with a full 12V battery. You might try and use a jumper cable and go straight from the + side of battery to glo plug buss bar. Do that for about 15 seconds or so and see if that helps. That should tell you if it's the plugs or not. If that doesn't help, it's in the wiring to the buss. Did you check your battery voltage when the glow plugs are on? If it's starting out less than 12V, that won't help....pulling 40-60 amps is bound to have some voltage drop. Mike</p></blockquote><p></p>