Another glow plug question B414

[Duvie]

Just purchased a B414 and all the wiring for the glow plugs was tore apart and Jerry rigged with bare wires and alligator clips! Ordered a new glow plug resistor/indicator that is supposed to fit a B414 and replace part number 3042230R91. Used a push button foot type switch for a ford to replace the missing switch. Removed all the glow plugs and they were good and .9 volt style. All glow plugs are wired in series along with the new indicator. The indicator glows bright after only a few seconds. I am competent when it comes to wiring and using ohms law and such and everything is wired correctly. It is a bit tough to troubleshoot as most meters are not very good at displaying fractions of an ohm. So my question is
Do I just have the wrong indicator? Picture is of the free dangling resistor the previous owner was using and of the new dash mounted unit. I have only seen that bigger coil advertised in the uk. The system seemed to work with that old larger coil taking 30 seconds or so to glow but there is not a good way to mount it as that portion is missing. Is there a correct replacement for that old indicator coil or am I going to fabricate something?

 

[JimB2]

You should measure 6V at the input to the first glow plug. The indicator resistor is supposed to drop 6 Volts across it.
There is a newer fast heat Bosch style glow plug kit available that is used on the older Mercedes cars.

 

[Duvie]

Digital meter doesn’t settle down quick enough to get a good reading before indicator gets too hot (also resistance is changing rapidly with the fast heating). I might have an analog meter at work I can borrow and try later in the week. Instance where newer isn’t necessarily better!

 

[Duvie]

Just decided to go with the newer 12 volt style heaters. Remembered using my dad’s Massy 65 as a kid with the pepper pot and was trying to keep it on this machine. Machine will probably be much better starting with the 12v anyway.

 

[Duvie]

That style glow plugs indicator seems to work with the 12 volt glow plugs that I installed. Takes about 10 seconds to glow and the machine starts up instantly! Prior to that she was almost impossible to start below 75 degrees. The 12 volt glow plugs were definitely the correct way to go.