The problem is your relay is not drawing enough current for the original circuit to work properly. Only a small current is needed to keep that relay energized once it is pulled closed. A better relay with a larger coil and real spring may be better suited for this application. I can't imagine the Jetta ignition coil needing so much more current that the ignition switch can’t handle it anyway. This may be one of those times where fixing a problem that didn’t exist caused more harm than good. Adding a relay here also added another point of failure and a relay welding closed can be as much of a problem as an ignition switch failing. Dennis -----Original Message----- From: neil N [mailto:musomuso@gmail.com] Sent: Saturday, August 09, 2008 11:53 PM To: Dennis Haynes Cc: vanagon@gerry.vanagon.com Subject: Re: Bentley wiring typo? Thanks Dennis. I thought I'd reinstall the fridge relay to solve the "handbrake on, engine off" problem. Didn't help. Related to all of this, I think the culprit to the "handbrake on, engine off" scenario has been found. Because the stock Vanagon wire from 15 of ign. switch to the coil, is a smaller gauge than what is used by the Jetta coil ( I installed a 2.0 Jetta engine), I installed a relay, that is (obviously) triggered by the stock ignition wire, to carry power from 30 to this larger wire that goes to the Jetta coil. Something I failed to mention in my original post regarding this odd problem. My bad. This evening, I recreated the scenario where the engine would stop, only with key "off" and handbrake on. When this happened, I left the handbrake off (down) and pulled the blue wire from the alternator. Engine stopped. If I understood everything correctly, as per Mark Drillocks suggestions, I'm pretty sure there is a "feedback" of power from the alternator to the "coil" relay I installed. Obviously this keeps the relay switch closed even if key turned "off". Odd thing. After engine has been driven a while, this won't happen. The ignition switch works as it should. Only seems to happen with a cold engine driven ~ 4 minutes. Funny. Either I'll install a diode on the blue alt wire, run a new larger gauge wire, or see how much current is drawn by the Jetta ignition coil and determine if the Vanagon wire can handle the load. (Thanks Mark!) Thanks again, Neil.
On Sat, Aug 9, 2008 at 7:58 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote: > Actually the ground for the fridge relay is done through the starter > solenoid. Two reasons for this. The fridge relay will be disabled while > starting, (overkill) and the back feed just as the engine starts and > before you release the key helps kick start the alternator. Tough to > explain but that is the way it works. > > Dennis > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > neil N > Sent: Saturday, August 09, 2008 3:00 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Bentley wiring typo? > > Hi all. > > I'm sorting out my hand brake "turns off" engine issue. Dennis Haynes > kindly wrote and indicated a lack of a fridge relay might the problem. > I'll connect the fridge relay from my 182A downstream from the blue > wire to aux battery relay to see if it helps. > > I'm using the '81 camper wiring diagram, but in checking "camper" > wiring, I'm curious about 97.32e of Bentley. > > It shows "to ignition/starter switch terminal 50" from 85 and "To > alternator terminal D+" from 86. > > Does the ground for the relay coil come from the case of the relay? > > I only have a 182A fridge relay in hand. (plastic case) > > Just curious. > > Thanks, > > Neil. > > > > -- > Neil Nicholson '81 JettaWesty "Jaco > http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engi > nes > http://web.mac.com/tubaneil > http://tubaneil.googlepages.com/ > >
-- Neil Nicholson '81 JettaWesty "Jaco http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engi nes http://web.mac.com/tubaneil http://tubaneil.googlepages.com/ |
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