1972 battery ground cable strap connection location

[crownline]

I ran mine down under and connected to the mustash bar mount hanger. Which bolts directly to the frame.
_________________
1972 Bus 1700 cc Single Carb. But not a progressive.
Barelymuvin
Wish I still had the ones I got rid of.

"It"s got some dings and dents and neither of us is going to SEMA."(Update, I went to SEMA in 2019 but the Bus stayed home)
[url=http://www.vw-mplate.com/mplate-8446.png]Click to view image[/URL]

[rockerarm]

[aeromech]

[Wildthings]

[SGKent]

[aeromech]

I run two ground straps frame to engine

I'm not saying that this isn't a good idea. In fact, I did it in my Toyota truck. I'm just saying that grounding the entire bus electrical system through the whole engine from tranny nose to fan case doesn't seem like a sound idea. If I had an engine here I'd use my fluke and measure the resistance between the tranny nose and the fan case. I'll bet it's higher than sending electrical returns back to the battery only through the frame. Now, as far as grounding the starter goes what Rockerarm did sounds like it would work well for the starter
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Wildthings]

I doubt that the resistance between the starter nose cone and the fan shroud can be measured with the meters most of us own.

[Tcash]

Just to reiterate so there is no confusion. 1972 Negative battery strap (cable) was connected to the battery tray with a brown/white wire that ran to the diagnostic plug.
Makes you wonder why they abandoned this idea?

[Tcash]

This discussion makes me think of a question I asked my teacher in JC.
Which way do the Electrons flow? His reply was science didn't know and it's magic.
This will give you an idea of how long ago I was in school. Because the flow of Electrons has been discovered and get this one, Lucas had it right.

Google
Electrons are negatively charged, and so are attracted to the positive end of a battery and repelled by the negative end. So when the battery is hooked up to something that lets the electrons flow through it, they flow from negative to positive.

Tcash

[aeromech]

[Wildthings]

[aeromech]

Well then, this will be interesting. Remember that every time you bolt something on like the fan case or the engine to transmission, you don't get a great mate. Especially if parts have been painted like fan cases. I'm really interested in finding out the answer here. I guess anyone with a type 4 could run out to their driveway with a multimeter and measure this pretty quickly. I have an 091 here but no engine right now.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Tcash]

Add loose bell housing fasteners and some oil and you can loose complete connection between the trans and engine case. Ask me how I know.

Tcash

[telford dorr]

For reference, the ONLY way to accurately measure real low resistance is to (1) use a meter with 4-wire resistance measuring capability (various high end Fluke and HP meters support this), or (2) do it the hard way: pass a known current (100 ma works well) through the resistance and measure the resulting voltage drop. [This is what the 4-wire measurement method effectively does. The current source is contained inside the meter, hence the extra pair of test leads.]

R = E / I

If I = 0.1 amp, then R = E x 10.

Here's the schematic (from the Gallery) for the current source

Trim R1 for exactly 100 ma current.

12 volts works well for the supply voltage.

Regular 2-wire ohmmeters (including my Fluke 8020B) can't accurately measure anything below, say, 10 ohms. Too many error sources.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[Ian]

You guys are crazy! You use a "voltage drop" test in VDC to figure that kind of stuff out.
_________________
All your Buses are belong to us.
Love and good roads!
IN LOVING MEMORY OF ROB CRESS 1968-2012
**ACHTUNG DO NOT USE AA BRAND PRODUCTS OR BUY ANYTHING FROM PACIFIC PARTS INTERNATIONAL IN CALIFORNIA**

[telford dorr]

That tells you if you have a problem. If you want to accurately measure and quantify the magnitude of the problem, you'll need to use a more advanced method.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[aeromech]

Here's what I did today

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Tcash]

Paint the ground on the chassis or put some liquid electrical tape on it, so it does not corrode.
https://www.google.com/webhp?sourceid=chrome-insta...pe%20lowes

Surprised you did not go to the battery tray.
Tcash

[1967250s]

Just measured with my Fluke from battery fan ground ( 8 mm bolt on right side) to the blower fan mount- I get 0.4 ohms. This goes thru fan housing, engine, tranny, tranny strap, body. From the transmission bell to the heater box is 0.2 ohms. Probably same to the battery ground. So-if you ground to the body then you double the resistance, just a tiny amount but measurable.
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'72 Elm Green Deluxe

[Malokin Martin]

If one is going to ground to the body, it would make sence to ground it on the vertical panel between the light housing and the engine lid. That way the straps are tidy. Just an idea. Coincidentally, this was where my 72 was grounded (likely not OG). Yours does look nice though!