adamb

I dont use a relay on 2 of my cars. I go from the strip fuse to a solenoid, to the battery, operated by a switch. In your case just go directly to the battery to heat up the plugs, easy. I like the idea of starting the engine before instillation, but have never done it. That sure would have been handy when I didnt put in the oil gallery plugs on a 616 I did a while back. Keep us posted.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"