LGL

Attached are pictures of my electrical test set-up, mostly from Radio Shack. It payed for itself when it let me test good my seat-back adjust motor without seat dis-assembly. By using inter-changeable connectors, you can pretty much connect to anything. Also shown is an in-line changeable fuse so that you can fuse according to the circuit being tested.
The wires and switches on the left are a mod to an idea I found on Rennlist. By using connectors on the relay test jumper, you can use a toggle switch or a momentary switch if you don't want the relay to stay closed.

hacker-pschorr

Where is the paint mixer?

That's a cool setup - how much do those power supplies cost?

LGL

Power supply cost is a function of max current. This one is 35 amps which covers most motors and it cost $ 120.

hacker-pschorr

That's not bad
I was about to rig up something similar using a car battery no longer in use. Your setup looks like a much safer test rig

blown 87

Nice, better than the battery pack I have been using by a long way.

fraggle

Dang this reminds me about my goal to buld a test relay with a bunch of led's on it (and bypass ability) so you can watch and switch for function during troubleshooting.

Some day.

6mil928

Very cool!

SharkSkin

Nice power supply you have there, LGL. I've been keeping my eye out for something similr at a yard sale or surplus. Not a priority for me, but definitely a nice-to-have.

Alan

Likewise - I designed such a thing but its way down on my list to actually build...

I started on a few though:

I do have a plug in relay with a small switch in place of the contacts (5A max though) and an LED in place of the coil - you can see it during construction here...

I also started on the monitor one but its not done yet: You plug in the relay which works normally as an SPDT - and can see what level each of the pins is - it will show 12v (red LED) & direct ground connection (green LED) and floating (no LED). It doesn't allow you to do anything to bypass the relay - its for monitoring only.

I also did consider a relay "break out box" - a relay base that feeds an other remote relay socket. It should have the same LED monitoring as this one I just described and also the ability to plug jumpers between pins. Ideally I'd like to have a double version that could handle the dual width relays as well as singles.

Alan

robot808

LGL,
I use the same thing. I had it left over from my R/C Car days. I must say, it has come in handy more than once.

the flyin' scotsman

The variable power supply comes in handy with many applications.

I too have a rig that I use with the r/c bird..........works well with the 928 also

Z

I've thought about getting one of the variable power supplies, but so far have just used either a car/lawn tractor battery, or an old desktop computer power supply for various testing and experimenting.

The 928 electric test bench gets a little busy sometimes.

worf928

Z, ya got some cool stuff there!

What catches my eye in particular are those plug connectors to the ECUs. Did you rescue those from old harnesses? Or can they be purchased for less than their weight in unobtainium?

(On topic: Yep. I have a power supply too. Comes in handy.)

Z

There's an LH and an EZK with PEMs in them, a SharkTuner, Innovate LMA-3, Innovate SSI-4, an old desktop computer power supply, an automotive multimeter, the two laptops, a small audio transformer, a few potentiometers, and more than a few jumper wires. One laptop is running the SharkTuner and Innovate Logworks software programs, and the other is running an oscilloscope/signal generator program that's putting out a simulated crankshaft position sensor signal through the laptop's sound card head phone jack. Basically it's a virtual version of an A/T equipped '88 S4 cruising down the highway at 100mph.



I've gotten several of them from a junk yard when I've been there. Some models and years of BMW and Volvo used them. I've also found other connectors and parts that are used in a 928 in various Mercedes, like the 928 ECU coding plug, climate control vacuum solenoids, etc.

dr bob

Lookin' at the jungle there... Red is Positive, right?