Glow Plug Relay

[maxfax]

Does the VW GP relay rely on the load of the gp's to control the amount of time it stays on??  I'm toying with the idea of using one of these as basically a timer to control the big GP relay on my Olds..

[Vincent Waldon]

Nope, coolant temperature.

[maxfax]

That's what I thought..  Thanks Vince!

[Vincent Waldon]

No worries... here's the relay pinout in case you decide to experiment further:

[maxfax]

Excellent!!  I was just trying to make out the goofy tract diagram when you posted that..  Thanks!

You don't happen to have the temperature to resistance of the VW temp sensor to you??  I need to decide on making an adapter for the VW sensor, or finding one that is comparable that'll screw in the intake..  I'm debating about just trying a simple temperature dependent on/off switch..  As I've been operating them manually I've found that it either needs them run a certain amount of time, or not at all...

[coke]

Looks like the diagram I made when I thought about putting the relay under the hood instead of in the fusebox.

[Vincent Waldon]

I've never seen an actual chart unfortunately... the sensor ranges from something like 30 to 300 ohms, with 30 being very hot and 300 being very cold.   

[maxfax]

That'll give me something to go from..  Most of the various temp sensors in my stash run from 1000 to 10,000 ohms, so It's looking like an adapter for the VW sensor is the way to go..  There's already a temp switch for the timing advance solenoid and fast idle..  If need be I suppose I could incorperate that into the mix...   Time for some trial and error testing..

Thanks yet again Vince!

[Vincent Waldon]

No problemo... please do us all the favour of posting back as you learn! 

[maxfax]

Will do..  It might come in handy for the next crazy sob that buys an Oldsmodiesel with an obsolete gp controller... 

[lovinthedeez]

if not trying to make it look stock, why not just run a push button ignition switch to fire a plain old napa solenoid to fire the little suckers.  and hi brett.    I'm baaaaaaaack.  never sold the jetta, and getting ready to tear it apart......again.   Been busy with my new wheelie machine.  69 honda trail k/o that I stuffed a 125 into.  street legal, needs no mirrors or turns

[maxfax]

Hey Bobby!!   Nice wheelie machine!  That thing looks great for it's age!!!  I'm glad you were able to hang on to the Jetta too!

I have a push button rigged on there for now, that's a rig in itself....  Nice thing about it is it already had the big starter-like solenoid for the glow plugs.  But the electronic module that controls that is dead, and not easily replaced..  This is on an '81 Cutlass diesel, and the car is nice enough that I'd kinda like to keep it stock looking if I can.. Many have opted to use the controller from the 6.2L powered trucks..  I'd have to go find/or buy one of those though, and I already have tons of VW parts about.. 

At some point I'd like to change the type of GP's in it too..  This car has the GM version of fast glow gp's.. Basically what they did was use 6 volt gp's and pulsed 12v to them..  For the time being I have a push button connected to the solenoid, with a turn signal blinker wired in there.. I'll have to keep the blinker even with the VW relay till I get that changed..

Here's some pics of the beast..  Needs washed, the birds have been having their way with it...
http://s295.photobucket.com/albums/mm124/maxfax3/Cutlass%20Diesel/

[maxfax]

There are crude figures with lots of room for inaccuracy.. Using a heat gun and temp gun this is what I got for rough and rounded readings from a MK1 GP temp sensor..  Temp is in Deg F

Temp     Ohms
30         3200
50         1400
100         200
150          80
200          40
250          20


With no temp sensor, the fast glow relay stays on for about 45 seconds..
At 30 it runs for about 25 seconds, 50 it runs about 12 seconds..   Doesn't seem to come on at all much over 70 deg F..  

[maxfax]

D'oah!!  Forgot to time the GP light.. 

[blackdogvan]

I've found a GP relay that is way better than the "normal" MK2 TD relay. The normal relay turns off as soon as the engine starts & stays on with just ignition power foreever on my setup. This Kraker relay turns off after a bit before start & stays on for 5-10 seconds after start.

 Kraker 443911261