Has anyone wired a momentary switch to there glow plugs. If so do you just wire a positive wire to the switch then from the switch to the glow plug rail. Let me know if you all think this will work. And as always thank you and have a nice day.

You should wire a momentary switch to the one of the relays, the relay will already be wired to the glow plugs. You need to disconnect the glowplug controller. There are 2 relays, disconect the relays from one another. Then wire the switch to the relay that does not go through the drop resisitor. Be careful to only hold the switch a maxium of 5-7 seconds. Upon starting, you can press the switch on and off a couple times, this will simulate what the glowplug controller would be doing.

I just replaced the relays and they are still not working. I need to know what controls them and where its located or just wire the relays to the switch. Does it matter what relay of the two I use and what post do I use. And as always thank you and have a nice day.

I just did this. I have a dual battery set-up and my 88 import has two relays. The ECU should be behind the glove box (mine is RHD). I don't know what a drop resistor is, or where it would be located. I believe from reading here and Pocuck that drop resistors may have been used on some models with 6V glow plugs. At any rate, I first checked by disconnecting the forward relay from it's control wire and hot-wiring it for 10 seconds. Worked good. So...
I purchased a momentary switch on ebay (toggle for me). I disconnected the control wire to the forward relay and ran wires from the positive terminal on the aft battery and the forward relay across the firewall, then through on the right hand side next to where the wiring bundle goes through. From there to my switch - next to a unused space to the left of my steering column. I put a rubber grommet in the firewall hole. Works fine.

I just had my head replaced and the glow plugs were replaced as well. The mechanic used Bosch. From what I have read, it's better to get MMC plugs that were specified for your particular set up - I guess there are lots. I think my ecu works okay, but is not compatible with the Bosch plugs. Too expensive to change. I think this will work better any way, and should extend the life of the plugs. Trial and error will determine the time to use the momentary switch. After mine has started once, it's good to go the rest of the day without glow plugs unless it sits for many hours.

What I have now is momentary switch on for a bit, instant start, clickety-click from the aft relay for 10-15 seconds (apparently what it's supposed to do) and I'm on my way. No more for the rest of the day - of course, it never gets really cold here.

I should have added. If you wire battery to switch to glow plug bus bar, you'll need big wires and a very heavy duty switch - lots of electricity.