[Vwdiesel] No glow ....

[Shawn Wright]

Yes, you are correct, the LED is driven from the relay, but does not necessarily 
indicate when there is power to the GP busbar. If you listen, you will hear the relay 
stay on several seconds after the LED goes out. There is also power to the GP bus 
during cranking. Of course, the GP fuse could be gone, and the LED won't tell you 
that...
And you are correct, grounding the temp sender wire will keep the GPs from turning 
on, but can also cause a malfunction on some relays I've found. They can 
sometimes buzz loudly when this happens. You can also leave the temp wire off, but 
not grounded, which will force the relay into the longest cycle mode (about 45 
seconds), which you can choose to interrupt by starting when you wish. Or you can 
do as I plan to, which is to add a resistor to give a short cycle even when the engine 
is hot. I just wired the relay into my '88 Vanagon (previously gas) so spent a long time 
studying the circuits.
Also, both Bosch and Beru make an 'upgrade' relay which stays on after the engine 
is running for a short period to reduce cold start emissions. Your AAZ may already 
have this perhaps, I don't know if VW ever used them. I'd like to find this relay and 
give it a try someday, supposed to be a direct fit...

On 4 Oct 2005 at 1:28, Derek <weasel1 at sympatico.ca> wrote:

> Yup, that's the motor and I think I may have solved the problem.  I'll try to
> confirm tomorrow.  I am sure its the glow plug temperature sender.  It makes
> perfect sense.  With my switch hooked up ( a wire literally is wound on the
> terminal that SHOULD be grounding to make the whole thing go like its supposed
> to  ... ) it works fine.  So, I am simulating the ground that the relay should
> be seeing from the temp sender, but isn't.  I guess the light on the dash is
> also somehow connected to this sender ?  The great thing about all this, is the
> fact that now that I know how it is all wired and supposed to work.  I can hook
> up an intercept switch to prevent the GP's from turning on in the summer when
> they are hardly needed ....
>   ----- Original Message ----- 
>   From: Libbybapa at wmconnect.com 
>   To: weasel1 at sympatico.ca ; vwdiesel at vwfans.com 
>   Sent: Tuesday, October 04, 2005 12:42 AM
>   Subject: Re: [Vwdiesel] No glow ....
> 
> 
>   If yours is the 1.9TD (AAZ) I imagine that your relay is the same as the 1.6TD
>   relay and so the tests would be the same.  I do have the Haynes for that
>   model/year, but it is on the shelf in the garage, and shucks, I'm in my PJ's. 
>   Tomorrow I'll check, if noone else kicks in first. 
> 
>   Andrew 
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Shawn Wright
http://zuiko.sls.bc.ca/~swright
'85 Jetta D 
'88 Westy 1.6TD 5 speed
 (see progress at http://members.shaw.ca/vwdiesels)
'82 Diesel Westy