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> What attaches to this engine ground lug?
jrmdir
post Jun 21 2021, 10:25 AM
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Hi:

Well I finally resolved my no spark issue but in the meantime noticed this empty - but used looking - spade lug on the top of the fan housing.

Any info on what used to go there would be appreciated. '73 1.7L

Thanks,

Ron

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914Sixer
post Jun 21 2021, 10:37 AM
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Only thing that comes to mind is for a ground for the 70-72 heater blower motor that mounted on engine, but your car is a 73. Other than that I have no clue. Maybe Jeff Blowsby will chime in, he makes the harnesses.
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930cabman
post Jun 21 2021, 11:48 AM
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We have an engine harness (from a 1975 model) with a brown wire (ground) that terminates in this area. The other end connects to the relay board through the 12 pin connector.
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JeffBowlsby
post Jun 21 2021, 01:05 PM
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QUOTE(914Sixer @ Jun 21 2021, 09:37 AM) *

Only thing that comes to mind is for a ground for the 70-72 heater blower motor that mounted on engine, but your car is a 73. Other than that I have no clue. Maybe Jeff Blowsby will chime in, he makes the harnesses.


(IMG:style_emoticons/default/agree.gif) Thats my take on it too. 70-72 engine transplant into a 1973 car? Its the ground lug for the heat fan mwhich comes off the ignition harness.
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JeffBowlsby
post Jun 21 2021, 01:06 PM
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QUOTE(930cabman @ Jun 21 2021, 10:48 AM) *

We have an engine harness (from a 1975 model) with a brown wire (ground) that terminates in this area. The other end connects to the relay board through the 12 pin connector.


Not the correct ignition harness for a 1975 car, which has no ground here.
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jrmdir
post Jun 21 2021, 02:38 PM
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Thanks everyone - great info!

So the plot thickens. Looks like I'm going to need to investigate to find out what this car has in it. It was built October of 72 as far as I can tell from the chassis # (door jamb sticker is missing.)

So if I understand correctly, the 73s had the heater fan grounded elsewhere? My fan is over in the driver's side corner with two wires going into the harness under the relay board.

Thanks again,

Ron
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JeffBowlsby
post Jun 21 2021, 02:59 PM
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QUOTE(jrmdir @ Jun 21 2021, 01:38 PM) *

Thanks everyone - great info!

So the plot thickens. Looks like I'm going to need to investigate to find out what this car has in it. It was built October of 72 as far as I can tell from the chassis # (door jamb sticker is missing.)

So if I understand correctly, the 73s had the heater fan grounded elsewhere? My fan is over in the driver's side corner with two wires going into the harness under the relay board.

Thanks again,

Ron


Sounds right for a 73-76
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r_towle
post Jun 21 2021, 06:42 PM
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If you plug that into the battery ground it will make your spark hotter .
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windforfun
post Jun 21 2021, 08:12 PM
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QUOTE(r_towle @ Jun 21 2021, 05:42 PM) *

If you plug that into the battery ground it will make your spark hotter .


(IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)
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jrmdir
post Jun 21 2021, 09:21 PM
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Thanks!
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wonkipop
post Jun 22 2021, 12:28 AM
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have that spade lug on mine. 74 1.8

its never had anything connected to it for 31 years i've owned it.

however believe its to with how the coil is/may/could be wired in?
or there is a wire running to it i no longer have connected or was never there.
i've noticed it wired up in some other 1.8 engine bay images i was referencing for verifying vac lines.

i will see if i can find those engine bay pics i had which show it.
curious too.
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wonkipop
post Jun 22 2021, 01:16 AM
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here is some 1.8s with that lug being used and wired.
including a very original low miler 74 dr914 owns.
and image from fac manual.

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wonkipop
post Jun 22 2021, 01:21 AM
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and here is mine.
lug not being used.
its still an original coil and reasonably original car.

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and here is one matches mine, coil etc wired up same, lug not being used.
looks fairly original as well.

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search me.
could have been a standard dealer delete and rewire on my car and this one (as its an engine ground to coil looks like in most of the images showing the lug being used?)
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JeffBowlsby
post Jun 22 2021, 04:52 AM
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I was thinking D-Jet cars in my comments above, but the 1.8L cars also have a ground wire in the ignition harness that could attach there.
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wonkipop
post Jun 22 2021, 05:34 AM
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QUOTE(JeffBowlsby @ Jun 22 2021, 04:52 AM) *

I was thinking D-Jet cars in my comments above, but the 1.8L cars also have a ground wire in the ignition harness that could attach there.


you are on it mr, b with the L jets.
the ignition harness wire on mine goes straight to the coil, but on one of those images of alternatives it goes to that ground lug on the engine and then another wire goes to the coil. but then there is another one, which seems to have the same ground (Brown wire) snaking back along the ignition harness wire and is doing something different.

i might take my car out with these photos and get an opinion from my mech about it.
mine runs fine, but there is something going on there with that lug for L jets.

electricity is my weakness and i had not thought about any of this until i saw this post...
now i am wondering.

but maybe these lugs are on 1.8s which might throw some light on enquiry about what engine is in the "1.7"?
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JeffBowlsby
post Jun 22 2021, 05:56 AM
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For 914s, the single lug appears to be correct for the 1970-72 1.7L, and the 1974-75 1.8L. Its a convenient ground point. Bet its also found on other VW based similar engines of the era.
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wonkipop
post Jun 22 2021, 06:18 AM
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QUOTE(JeffBowlsby @ Jun 22 2021, 05:56 AM) *

For 914s, the single lug appears to be correct for the 1970-72 1.7L, and the 1974-75 1.8L. Its a convenient ground point. Bet its also found on other VW based similar engines of the era.


hmm.........might be on L jet 412s in 74?

what did they connect up to it on the 70-72s?
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914Sixer
post Jun 22 2021, 06:36 AM
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Since your car was built in October 1972, the engine was probably assembled with fan housings used from the 71 model run.
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930cabman
post Jun 22 2021, 08:19 AM
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I would bet one of three things: what is in the parts bin today Stosh?, remember VW was constantly making changes to every part of the cars or a prior owner/mechanic has changed the harness. Any of the above can be rectified by adding a grounding lug and connecting the brown wire or disregard the lug if there is no brown wire.
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JeffBowlsby
post Jun 22 2021, 09:11 AM
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QUOTE(wonkipop @ Jun 22 2021, 05:18 AM) *


hmm.........might be on L jet 412s in 74?

what did they connect up to it on the 70-72s?


It is for the heater fan ground
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