Andre Hedrick

https://rennlist.com/forums/928-foru...-solution.html

If you don't want to spend the extra $200 for the newer directions switch and select toggle switch in the well thought out solution above, here is an alternate solution using a single DPDT from RadioShack.

Relay
Socket

First picture is the original wiring decode by probing (fox/hound).

Second picture is the new wiring diagram, and the use of a DPDT relay allows one to use a DPDT relay in the drivers side door.

Third picture is the 85 944 transmission with extended break out cable with terminal block, as both sides needed extensions so the the Gray/Green is now Green, and Brown is now Red.

Fourth picture shows the ease of access via the coin holder or removal of the map pocket/arm/handle.

Alan

I have no idea what your "wiring" diagram means.... DPDT relays do not have standard pinouts - you need to reference it explicitly, plus I don't understand your symbols. You need to explicitly show the direction switch (by direction) and motors (by side & function).

It is certainly possible to do 2 relays (1 per side) with all local wiring (e.g like the plug-in adapters) or do 1 relay on the drivers side and I believe a single extra wire over to the passenger side. Or use new style switchgear and 2 extra wires.

Alan

Andre Hedrick

Fair enough, Alan. I am waiting for my transmissions out of a 944 to finish the install. I used 4 sets of lights with diodes the mimic the motor logic.

I will replace the original diagram with a better one, that was my working model to do the changes. It does work logically with the lights and diodes.

All points noted, and thanks for the feedback.

Eplebnista

You might want to add a blocking diode across the relay coil to prevent voltage spikes if there is no diode built into that relay.

Andre Hedrick

What kind of debounce event are you expecting?
If it is an issue, on can replace the RadioShack jobber with a proper relay.

Eplebnista

I don't have any idea. I am not an EE, just a guy who has been tinkering with crap, including building electronic gizmos, for 45+ years. Conventional wisdom is that field collapse in relay coils can cause transients. Whether that matters in this application, I do not know.

Alan

I'd not bother in this case - the diode across the coil is to protect a transistor drive stage - especially an FET drive stage - since here all we have is motors and switches there is nothing to damage. It still can cause spike coupling back to the supply rails but this is of little concern in most automotive case since the battery is a low impedance for direct supplies and many of the consumers are also low impedance on the switch (15, X) supplies.

Andre - haven't worked though all this yet - but this looks much better - Nicely documented - i think you have all the right parts shown now.

Alan

Andre Hedrick

Thanks Alan, and I am waiting on the official 928 electrical wizard to cast his approval.

Bump to wake Alan.

tailpipe

I'm not exactly sure what your trying to do I'm asuming you want to adapt the mirrors to work with the porsche wiring. My friend and I have been rebuilding the flag type mirrors using mirror motors out of a buick roadmaster from the early 90s its basically a plug and play the motors work the same way just have to match to the rights wires the only problem we had was matching the motors to the flag shell we ended up just bonding them in using black windshield adhisive. Not sure if this might make things easier

Alan

I think those investing in Aero mirros that come with Porsche motors already installed probably want to use the mirrors as is without modifying the motors. Besides Aero mirror have much less available space inside than flags. It is a little work when converting from the earlier single motor+solenoid to the later dual motor types but there are at least 3 ways to do it - all involve adaptation on the car side - either a wiring/equipment change or relay additions (or combinations of these) but are not otherwise particularly difficult - just fiddly.

Alan

Andre Hedrick

My new set of aero motors for 911's 965.624.901.00
Picked them off Ebay for $40.00 each! NIB

Dan87951

Just curious where you got the aero mirrors at? Looks nice!

Andre Hedrick

Found them on eBay 6+ years ago for about $450 in a box of pieces to assemble.

Alan

Andre - Can you determine which of the wires does what ?

The pairs per motor should be:

M1: White & Blue

M2: Red & Black

Does M1 control L<->R plane OR U <->D Plane? (you may have to install to housing to determine

can you also determine the polarity of the movement?

e.g. if M1 is L/R does White (+) Blue (Gnd) Cause Left or Right movement etc for each pair


It is quite unclear from the diagrams which is which in both senses...

Alan

Andre Hedrick

Black/Red is Up/Down

White/Blue is Left/Right

1 Black (+) up
2 Red (+) down
---------------------
3 Blue (+) right
4 White (+) left