BobDeSoto Posted August 12 Report Share Posted August 12 I have a 12V Jump Pack. Can I use it to start my 6V car? Quote Link to comment Share on other sites More sharing options...
Solution Mark D Posted August 12 Solution Report Share Posted August 12 Yes it will work, although many might disagree. Jumper pack positive clamped to the block or other convenient ground, then with key on briefly touch the negative jumper pack cable to the top of the starter cable post. Quote Link to comment Share on other sites More sharing options...
JBNeal Posted August 12 Report Share Posted August 12 Ya might want to disconnect that 6V voltage regulator before attempting to jumpstart 12V Quote Link to comment Share on other sites More sharing options...
Sam Buchanan Posted August 12 Report Share Posted August 12 (edited) 1 hour ago, JBNeal said: Ya might want to disconnect that 6V voltage regulator before attempting to jumpstart 12V If the jumper cable makes contact with the large starter terminal, and the starter isn't engaged with the ignition switch, the voltage regulator doesn't see 12v so it isn't a factor. Edited August 12 by Sam Buchanan Quote Link to comment Share on other sites More sharing options...
Mark D Posted August 12 Report Share Posted August 12 Caution that you shouldn’t fully connect to the starter terminal. Momentary contact is usually enough to get the starter to turnover. This momentary contact allows quicker removal from the post when the motor starts so the starter motor can retract and disengage. 1 Quote Link to comment Share on other sites More sharing options...
soth122003 Posted August 12 Report Share Posted August 12 My 12v jump pack had the on/off switch. I would connect red cable to a pos ground and the black to the starter,. turn the key on and hit the switch. When the engine started, turn the switch off, disconnect the cables. I never had any ill effects on the VR or other electrical components. Connecting it that way usually sent the 12v only to the starter. IMHO. Joe Lee Quote Link to comment Share on other sites More sharing options...
Sam Buchanan Posted August 12 Report Share Posted August 12 (edited) 41 minutes ago, soth122003 said: My 12v jump pack had the on/off switch. I would connect red cable to a pos ground and the black to the starter,. turn the key on and hit the switch. When the engine started, turn the switch off, disconnect the cables. I never had any ill effects on the VR or other electrical components. Connecting it that way usually sent the 12v only to the starter. IMHO. Joe Lee Joe, I was wondering if the master switch on the pack would work, don't know if the master is designed to carry the load of the pack or merely triggers some sort of relay. After studying jump packs I also wondered if the fail-safe circuitry in some packs would prevent the pack from delivering power if it sensed momentary high current arcing. But it looks like your pack does the job. The method I described will work with a booster battery and (big!) jumper cables, and it is best to make the momentary connection at the booster rather than the starter. Edited August 12 by Sam Buchanan Quote Link to comment Share on other sites More sharing options...
soth122003 Posted August 12 Report Share Posted August 12 Sam, I think so too. To make a connection at the starter or ground, produces an arc. The arc aside from the fire hazard, can weld itself to the connection point (if only lightly) and the surprise of such an event can cause the timid to jerk away. As a friend of mine quotes often "12v can't hurt you, but it can make you hurt yourself". Joe Lee Quote Link to comment Share on other sites More sharing options...
Sam Buchanan Posted August 12 Report Share Posted August 12 (edited) ........................................... Edited August 12 by Sam Buchanan Quote Link to comment Share on other sites More sharing options...
Dan Hiebert Posted August 13 Report Share Posted August 13 Ditto positive responses. It is not the preferred method, it will indeed work, but you do have to be careful. When we were looking at our D24 before we bought it, it was in the back of a used car lot. The proprietors weren't car guys, (that's a longer, slightly amusing, but unnecessary story), and when we wanted to see and hear the car run, they jumped it with 12v - several times over a week. Not because it would work, but the car having a 6v system went right over their heads. They went directly pole to pole on the battery. I wasn't as suave on old cars then, but I still questioned what they were doing. They were so anxious to get rid of the car that I talked them into a short warranty on the charging system. Thankfully it didn't seem to hurt the system, I have all the same electrical components in it now. Quote Link to comment Share on other sites More sharing options...
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