Chris,
Here is the info you need....

Inexpensive and reliable onboard glow system.

Here is a system that I have been using for a few years now. I tried some of the manufactured glow systems and found them lacking. I was told by one manufacture when I called with questions that if I had a big enough battery his would make it glow the whole flight. So I said I can do that myself and save about $40-$50.
This system is very reliable. It does not burn up glow plugs. I get about 40 minutes of continues glow with one charge. The engines have a very quick response. I have used this system on my Satio 150 inverted, 2-OS 91's inverted, Magnum 61's. All parts are available at your local Radio Shack. I have included a couple of pic's and a diagram of the set up. I have $12.00 in the whole set up minus the glow plug connector.( which you have to buy with whatever system you buy). The $12 does include battery which a bought system does not.

You Need:
part # 274-1569 Size M Coaxial DC Power Plug....... For charge Jack $2.49 2 pack
274-1563 Size M Panel Mount DC power Jack..... $1.99
275-634 SPST ToggleSwitch $2.99
C size Battery Holder $.99
Rechargeable 2000mah C Battery $7.49 2 pack


This is all you need to make the onboard glow set up. I do use 18 or 20 Gauge wire for this. I solder the heavier wire to the battery holder also. You have to have a solder gun to do this because it has to be done fast not to melt the plastic. ( just like the heavier wire) I have my 3 engine Sovia Marchetti S79 set up with 3 of these. It adds only 4 oz to the plane, each. The set up fits easily in an engine compartment. The battery holder has holes so it can be screwed to the firewall or engine mount. I have one complete set in each of the nacelles. I just turn them on at the beginning of each flight and leave it on.


Here are pic's of the parts.
A diagram of the set up .
The Nacelle of my S 79 with the charge jack and switch.

Ty

I have had over 20 flights on the S79 without an engine cutting off.....