Remote glow gizmo's can sometimes be a royal pain in the rear end. I have one plane that kicks off nearly ever remote adapter I've tried. The main issue im my case is that the engine is large and soft mounted, so it shakes quite a bit. Assuming you don't have a broken wire or the like, my guess is your remote boost just isn't making complete contact everywhere or it is shorted. As others have indicated, the problem probably isn't with case ground. It is probably with the plug connector.

You can double check that everything is working by plugging in a spare plug to the remote boost, and then ground the plug by holding it against the engine case. It should glow.

As for remote designs, I've really only seen two plug connector designs that work well. Both use a spring clip to lock onto the channels on the glow plug post and use case for ground. The twist lock designs in my experience always seem to fail after X number of flights.

One design that works well is intended for helicopters, but would work on planes too. The basic design is shown here...

http://www4.mailordercentral.com/hel...?number=803470

It could be used on a plane with slight modification. It however does not work with most 4 stroke engines becase the clip is too large and will ground out on the head of most 4 strokes. I have used this remote setup on helis with out any issues. The spring clip is clearly visible.


Another design that works well is the Tettra seen here...

http://www.centralhobbies.com/glow/glowcap.html

It is a short kit, but the clip design is slick and works very well and is generally what I use. The connector only slides over the center post of the glow plug. There is a spring wire that locks into the channels of the center plug post. Once clicked on, it is very secure. To release, simply press on the spring wire to pull it out of the channel. You can't really see the clip in the picture, but it works similar to the heli design, but is much more compact.

I have also made remote connectors using the collar method described in Scar's post. It actually works very well and I reccomend it. I generally replace the standard collar set screw with a socket head screw for easier use. I've also found that grinding the end of the screw to a point does a better job as it will naturally guide itself into one of the plug post channels, making for a more secure fit. Just be sure that the collar only touches the center post, otherwise you will ground out the collar and you won't get any current to the glow element.

Cheers.