that is a wiring diagram with 1 battery pack

Super 252 - USB Powered 1/43 Slot Car Racing Set

Du-Bro 578 - 8-32x3/4 Socket head scr

E-Firestorm 10T Flux RTR

even at slow fan speed

SkyRC SK-600066-01 - Engine Heater SkyRC snor that is a wiring diagramThe SKYRC engine heater uses technology similar to that used by Formula 1, Indy Car and NASCAR Teams! It will properly pre heat your engine to 60 70C in 10 minutes based on ambient temperature. SKYRC engine heater will pre heat all the critical parts of your nitro engine, giving you a minimal of stress and wear on the engine. It help relieve the stress on the crank, con rod, piston and sleeve during warm up. It also give you a very easy and smooth