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Unread 02-19-2013, 11:01 PM   #1
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Default Tow or Run-same voltage?

Long-time lurker, first-time poster with what is probably a stupid noob question. I have an 08 Precedent. Just installed the 12v-8v conversion kit (thanks nobogez42!) I wanted to be sure I had everything right, so when I had all the battery cables in place, except the last one, which goes through the OBC, I measured the voltage. With the tow/run on Tow, I put one lead on the negative post of the #6 batt, and the other on the ring connector on the last cable. I got 50.8v on my cheapie multimeter. Thought this was strange, since I was in Tow, and according to another post here, should have seen around 5v? I flipped the switch to run and measured again, got the same 50.8v. Keep in mind that the last cable is NOT connected to the battery..
What could I have done wrong here? Should this reading have been different, or am I misunderstanding the function of the tow/run?
I want to get some of y'all's more experienced opinions before I fry something by connecting that last cable...

Many thanks!
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Unread 02-19-2013, 11:33 PM   #2
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Default Re: Tow or Run-same voltage?

If I am not mistaken, you are reading - voltgage cuz you said you had one lead on the negative bat post and the other on the cable going through the obc which I believe goes to the negative bat post which the other end goes to b- on the controller.
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Unread 02-19-2013, 11:44 PM   #3
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Default Re: Tow or Run-same voltage?

Yeah, but since that cable's not connected to the battery, shouldn't this be the same as measuring the voltage through the whole pack? There is nothing connected to the neg post on battery #6. All of the other cables are connected, so in my mind, which is not electrically oriented, I'm just completing the circuit with the multimeter. The voltage would flow through all 6 batteries, then through the multimeter, then through the controller and solenoid, back to the batteries, right?
Sorry if it's a dumb question, I just don't want to fry the electronics if I connected something wrong...
Thanks
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Unread 02-19-2013, 11:53 PM   #4
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Default Re: Tow or Run-same voltage?

Ok but you got 50.8 so whats the question? The run tow switch is not going to effect that reading tha way you are measuring.
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Unread 02-19-2013, 11:57 PM   #5
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Default Re: Tow or Run-same voltage?

I guess that's where I'm confused. I assumed that since we're supposed to flip that switch to Tow before we do anything with the electrical system of the cart, that it would cut the voltage, or break the circuit, so I could connect the last battery terminal without arcing.. So do you think it's OK for me to go ahead and connect the last cable?
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Unread 02-19-2013, 11:58 PM   #6
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Default Re: Tow or Run-same voltage?

The run tow switch does not cut off all voltage, it is to cut off the controller so you can move the cart without the runaway brake system engaging. So even with the switch set to tow if you start wrenching on the cart you still have a possibility of electricuting yourself. You have to break the circuit to prevent that.
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Unread 02-20-2013, 12:04 AM   #7
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Default Re: Tow or Run-same voltage?

Do I think its ok to hook up the last cable? I can't say, but thats how I have always done it. Main thing is to try to avoid sparks, controllers hate sparks.
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Unread 02-20-2013, 12:09 AM   #8
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Default Re: Tow or Run-same voltage?

I'm not a big fan of sparks either. So with the switch in Tow, just go ahead and hook up the last one? Nothing else to do to break the circuit safely? I'll give it a shot. Thanks for your help..
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Unread 02-20-2013, 02:44 AM   #9
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Default Re: Tow or Run-same voltage?

Ok, I had no sparks when I hooked up the last cable, which is good. I also seem to have no other power, not even the reverse buzzer, which is bad. I'll go back through all the connections tomorrow and see what's up.
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Unread 02-20-2013, 06:19 AM   #10
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Default Re: Tow or Run-same voltage?

. . . you initial post has me a little confused . . . you say that all cables except the one that goes thru the OBC were connected . . . the one going thru the OBC is a NEGATIVE cable, correct? The reason I ask this is because you also stated that when you tested the pack voltage, you put the meter lead on the #6 battery's NEGATIVE post and the other meter lead "on the ring connector on the last cable". Was the "last cable" the one you ran thru the OBC? Was it a POSITIVE cable? If so, you may have hooked you system up backwards . . . hopefully, my interpretation of your initial post is wrong . . .
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