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-   -   Can someone please explain to me what the start bridge relay does? (https://rennlist.com/forums/928-forum/731073-can-someone-please-explain-to-me-what-the-start-bridge-relay-does.html)

Alan 12-11-2012 08:45 PM

The sole purpose of the switch is to dissengage the cruise during gear changes - then it auto resumes - this features works very well - but is rather important on a manual car, lest the Bwaahh! becometh too much....

Apparently only the drivers of Rogerboxes need to be protected against themselves for inadvertent starter issues...

Alan

James Bailey 12-12-2012 01:50 AM


Originally Posted by Alan (Post 10065413)
Apparently only the drivers of Rogerboxes need to be protected against themselves for inadvertent starter issues...

Alan

I rather like that :)

Landseer 12-12-2012 03:08 AM

3 Attachment(s)
Regarding starter bridge for manual cars: configuration changed for 1982 MY.
That bridge only exists in the CE panel of manual cars, MY 1981 and earlier.
(Alan is picturing a bridge in a late model panel, maybe his 94, for which purpose is a backup light bridge)

Mid year manual cars have a start bridge, but its located in the hatch area.
And, beginning 1982, both auto and manuals have the start relay.
See the first 2 documents below.


The confusion comes in when people with manual cars newer than 1981 go searching for the start bridge so solve a no-turnover issue and find a relay.

Its perpetuated because the manual start bridge is referenced in relay diagrams, including PET and 928specialist site, and has a part number. This co-location infers that the bridge located in CE panel.
But they are talking about two different configurations of bridge.

82-on manual owners should find a relay in the slot. And the bridge is a wire jumper near where tranny harness attaches in hatch area. If automatic, instead of the jumper, there is a shift linkage position switch ensuring car will only start in P or N.

See the third document below.

dprantl 12-12-2012 10:03 AM

I never did understand why this interlock was put into place for "safety". Starting an automatic car in gear is much less dangerous than starting a manual car in gear, with the torque converter not being direct drive with the wheels when stationary.

Dan
'91 928GT S/C :eek: 475hp/460lb.ft

ledee416 12-12-2012 03:05 PM


Originally Posted by dprantl (Post 10066412)
I never did understand why this interlock was put into place for "safety". Starting an automatic car in gear is much less dangerous than starting a manual car in gear, with the torque converter not being direct drive with the wheels when stationary.

Dan
'91 928GT S/C :eek: 475hp/460lb.ft

unless of course someone is standing in front of it :)

PorscheTX928 05-18-2015 02:40 AM

Need a little help with starter bridge issue
 
1 Attachment(s)
First...I have an 82 928 S (manual). From what I have read from the previous posts is that my 928 has both the relay(XIV) and a bridge (somewhere in the spare wheel well). Is this correct?

I ordered the Relay referencing the wiring diagram and part numbers from Porsche International..According to this wiring diagram Relay XIV for 82-84 model years has part no. 92861247300(Bridge for Starter-M/T). I ordered the part but it is not a relay. I have included a picture. I am assuming that this is for the bridge in the sparewheel well.


Ok...I have two questions - 1) What is the part no for the relay that goes in the relay XIV spot? And 2) Can someone point me to a picture or explain where I can find the bridge in the spare wheel well? I dont see it, and have no idea where else it could be.

Thanks.

Alan 05-18-2015 10:46 AM

You can use a standard 53B relay from Roger (etc) for any starter relay (even the early model start DISABLE relays) - or in fact you can use any standard Bosch SPST or SPDT relay (but get a reputable brand).

The bridge goes behind the plastic cover in the spare wheel well - above the battery box and ahead (in the car) of the spare wheel. many have never realized its there until directed to it - there may be a 'felt' like cover over it. You most likely already have a similar bridge installed there.

Alan


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