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  #1  
Old 06-20-2007, 12:23 PM
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Question Quick Glow Plug Relay question

I could probably find the answer with some searching, but I'm 2100 miles from home, so I appeal to the mass wisdom:

For the glow plug relay seen here:


Which pins do I jump at the relay to energize it?

I'm going to assume La is for the indicator on the dash, and one of 15, 31, or 50 is from the violet wire to shut down the relay when the engine is operating, but of the other two, which switch the relay on?

Any help is greatly appreciated!

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1983 300SD 467,000 km - 473 champagnermetallic

location: 34°5' N 106°53' W (Socorro NM, USA)
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  #2  
Old 06-20-2007, 03:47 PM
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If you're in a pinch... Don't worry about the circuitry of that box right now. Just take a piece of decent sized wire (maybe 10 guage) and pop the terminal cover off of the back of the harness that goes to the glow plugs. Tape one side of your 10 guage wire to one of the wire terminals (all of them are connected internally in that box so if you touch the wire to one, all of them are in the circuit). Then hook the other side to your possitive battery cable or a jumper cable to the wire if you need more length. This will work in a pinch. I don't recommend it obviously as a normal safe practice. But it will do the trick in a pinch.
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  #3  
Old 06-20-2007, 04:15 PM
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As Funk says, use a 10 AWG wire. Use a wire much smaller and it will turn into a heating element in your hands.

TimK
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_________________________________________
83' 300D Turbo - 300K + Miles
00' 1.9L TDI Beetle
85' 6.5L Turbo, GV-OD, GMC Suburban,
67' 2.5L Diesel NA - Land Rover Series IIA

Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.
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Old 06-21-2007, 07:01 AM
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Thanks all, the emergency fix worked!

I actually used 8ga solid copper wiring, took the terminal cover off the glow plug harness at the relay, bridged all the connectors with the wire, taped it up and used my jumper cables to energize the glow plugs. Fired right up after that!

I'm now testing the glow plug relay itself and there's something strange going on. I have battery voltage at the input and across the fuse, and when the relay is activated with the glow plug harness disconnected, there's proper voltage at the pins for the glow plugs. But when I reconnect the harness, the glow plug light goes out, won't come back on uncer any circumstances, and there's no voltage at the plugs.

I'll be checking the wiring harness to the relay today, but is it more likely the relay is faulty?

Thanks again!
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1983 300SD 467,000 km - 473 champagnermetallic

location: 34°5' N 106°53' W (Socorro NM, USA)
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  #5  
Old 06-21-2007, 02:18 PM
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In my experience, it is more likely the relay or plugs that are the problem and not harness. You should also inspect the plugs. One of them may be acting as a dead short. You could try hooking up the harness and energizing the plugs one at a time by disconnecting the harness at the plugs.

TimK

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_________________________________________
83' 300D Turbo - 300K + Miles
00' 1.9L TDI Beetle
85' 6.5L Turbo, GV-OD, GMC Suburban,
67' 2.5L Diesel NA - Land Rover Series IIA

Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.
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