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Unread 10-07-2016, 10:39 PM   #11
Not Yet Wild
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Default Re: Hot A2 wire after motor upgrade

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Originally Posted by jjance View Post
I just thought of a very important question. When you said you replaced the cables, did you replace them with larger cables or did you replace them with stock #6 gauge cables? You never did say.
I replaced them with 4 AWG from one of our local cart shops.

As a test, I ran to the store and grabbed some (temporary) 4 AWG starter cables and replaced the A2 wire. Drove a short distance, and A2 was no longer getting hot, but now A1 was. Replaced A1 and after a short drive everything seems good now.

I'll take it for a longer test later in the weekend and report back. If all is well I'll have the local shop make up a few more cables for me and get everything buttoned back up.

Thanks for all of the help so far!
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Unread 10-08-2016, 11:41 AM   #12
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Default Re: Hot A2 wire after motor upgrade

Be sure to run the new main negative cable through the OBC you will have to put lug on after routing cable through the hole.
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Unread 10-10-2016, 12:13 AM   #13
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Default Re: Hot A2 wire after motor upgrade

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Be sure to run the new main negative cable through the OBC you will have to put lug on after routing cable through the hole.
Thanks!

We took the cart out for several longer drives over the weekend, and A1/A2 temps are good. Now F1/F2 wires are getting warm, so it looks like I'll be upgrading those as well.
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Unread 10-10-2016, 09:07 AM   #14
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Default Re: Hot A2 wire after motor upgrade

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Now F1/F2 wires are getting warm, so it looks like I'll be upgrading those as well.
If you have a Curtis 250amp controller make sure you can find a connector that will fit the connection on the controller. Then you can just use the old A1 and A2 wires.
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Unread 10-10-2016, 09:26 AM   #15
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Default Re: Hot A2 wire after motor upgrade

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Originally Posted by swbgw View Post
Thanks!

We took the cart out for several longer drives over the weekend, and A1/A2 temps are good. Now F1/F2 wires are getting warm, so it looks like I'll be upgrading those as well.
There is no need to replace the F1/F2 wires with anything larger than the OE size of 10 gauge (?) they do not carry much amperage at all... If you suspect they are corroded replace and make sure that the connections are clean & bright and are not loose....
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Unread 10-10-2016, 10:06 AM   #16
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Default Re: Hot A2 wire after motor upgrade

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they do not carry much amperage at all
Actually they do carry a lot of amperage. A Curtis 250A controller is rated at 25amps field current. An Alltrax 500a controller is rated at 50-60a field current. The recommendations are as follows. If your motor has 1/4" field connections 10 gauge is ok. If the terminals are 5/16" use 6 gauge. And since you already have two 6 gauge wires running to the motor use them.
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Unread 10-10-2016, 10:35 AM   #17
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Default Re: Hot A2 wire after motor upgrade

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Actually they do carry a lot of amperage. A Curtis 250A controller is rated at 25amps field current. An Alltrax 500a controller is rated at 50-60a field current. The recommendations are as follows. If your motor has 1/4" field connections 10 gauge is ok. If the terminals are 5/16" use 6 gauge. And since you already have two 6 gauge wires running to the motor use them.
10 gauge wire can reasonably carry 50 amps...

And correct me if I'm wrong (like no one wouldn't) but on the stock 250 amp controller the connection for F1/F2 is a 1/4" Tab Quick Connection which you will not likely find sized to accept 6 gauge wiring...
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Unread 10-10-2016, 10:59 AM   #18
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Default Re: Hot A2 wire after motor upgrade

I agree 10ga is all you will need for F1 and F2.

6ft of 10ga wire has 0.006Ω resistance so at 50amps You will be loosing 0.3v on the wires, it is not a factor.

The motor would also have to be stalled to demand 50amps of field current.
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Unread 10-10-2016, 11:07 AM   #19
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Default Re: Hot A2 wire after motor upgrade

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And correct me if I'm wrong (like no one wouldn't)
I've already addressed that in my previous post.

Quote:
10 gauge wire can reasonably carry 50 amps
And a 6 gauge wire can reasonably handle a 250 amp controller output. But keep in mind that these are performance upgrades. For people wanting to go a step above the ordinary.
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Unread 10-10-2016, 11:21 AM   #20
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Default Re: Hot A2 wire after motor upgrade

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I've already addressed that in my previous post.



And a 6 gauge wire can reasonably handle a 250 amp controller output. But keep in mind that these are performance upgrades. For people wanting to go a step above the ordinary.
You're not addressing the 1/4" Tab Connection on the controller? Please show us where to buy a 6 gauge to 1/4" Tab Female Quick Connection? The largest I've seen is for 10 gauge...

As to a "step above the ordinary" why does my 500 amp controller not call for replacement of these wires?
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