745TD electrical mystery....

740-estate-nut · May 1st, 2006, 20:07

hi y'all
I helped a mate of mine to jump start his car... a 2001 pug 406 TD...
I connected the jump leads up, and reved my car to about 2,500.. nothing happeded to his car, so we decided to wait to see if my car would charge his...
after about 15 mins of my car idling, we decidid to start his car, so I reved it up to about 3,000 until his started...
I disconnected my leads from his car, then everything electrical went dead on my car... lights, stereo, indicators, the lot.. but the engine was runing sweetly...
I drove it home, turned it off.. and just wondered.. so I turned the key to the glow position and everything came back on.. like nothing had happened...
Can anyone explain??
Cheers
Simon

Peter D · May 3rd, 2006, 08:19

Never run the donour engine when jump starting another car. run your engine only to boost charge the dead battery then turn your off completely and then start the other car, Your lucky you ahve an alternator or an ECU left. Regards Peter

Peter Milnes · May 8th, 2006, 00:41

I am afraid that your advice about not running your own engine when supplying a jump to another car is not very sound advice. As an electrician (I started as an aircraft electrician then progressed to lecturing on the subject) I have always advocated to give a few revs to the donor engine and have advised others so with no ill effects whatsoever. The effect that was noticed was due to possibly not letting the engine idle before disconnecting the jump leads. As can be told the engine and electrics suffered no ill effects whatsoever. When supplying power to another vehicle it is essential to keep your own engine rotating so that should the donor vehicle flatten your battery you do not loose the use of both vehicles. Both AA and RAC advocate this method.

All the best, Peter.

May 1st, 2006, 20:07	#1
740-estate-nut Nuts about 7XX estates Last Online: May 11th, 2007 22:03 Join Date: Feb 2006 Location: Omagh	745TD electrical mystery.... hi y'all I helped a mate of mine to jump start his car... a 2001 pug 406 TD... I connected the jump leads up, and reved my car to about 2,500.. nothing happeded to his car, so we decided to wait to see if my car would charge his... after about 15 mins of my car idling, we decidid to start his car, so I reved it up to about 3,000 until his started... I disconnected my leads from his car, then everything electrical went dead on my car... lights, stereo, indicators, the lot.. but the engine was runing sweetly... I drove it home, turned it off.. and just wondered.. so I turned the key to the glow position and everything came back on.. like nothing had happened... Can anyone explain?? Cheers Simon __________________ I own a Gold 745 TD D24T Used to have a 745GL B200E but that died.... :-(

May 3rd, 2006, 08:19	#2
Peter D Peter D Last Online: Mar 2nd, 2015 21:03 Join Date: Dec 2002 Location: Livingston	Never run the donour engine when jump starting another car. run your engine only to boost charge the dead battery then turn your off completely and then start the other car, Your lucky you ahve an alternator or an ECU left. Regards Peter

May 8th, 2006, 00:41	#3
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	I am afraid that your advice about not running your own engine when supplying a jump to another car is not very sound advice. As an electrician (I started as an aircraft electrician then progressed to lecturing on the subject) I have always advocated to give a few revs to the donor engine and have advised others so with no ill effects whatsoever. The effect that was noticed was due to possibly not letting the engine idle before disconnecting the jump leads. As can be told the engine and electrics suffered no ill effects whatsoever. When supplying power to another vehicle it is essential to keep your own engine rotating so that should the donor vehicle flatten your battery you do not loose the use of both vehicles. Both AA and RAC advocate this method. All the best, Peter.

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