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Electric Club Car Electric DS, and Precedent golf cars |
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08-15-2014, 10:49 PM | #11 |
Not Yet Wild
Join Date: Aug 2014
Posts: 4
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Re: 91 Club Car: Forward Only, No Reverse
Wow, NO replies at all for 24 hours, then a flood of good discussion in the last 8...
I finally got a chance to review the replies and run some tests this evening and I have to tell you I thought CTD was on the right track when he kept pointing out my 18V on the purple wire going back to the motor (see photo). To further support his (and my) presumption of a motor issue, what I didn't mention in the original posts was that I had ohmed out the F/R switch during my tests: in the forward position, top bus bar is shorted to purple & bottom left bar is shorted to white (grey in Sergio's diagram); in reverse, top is shorted to my white wire & bottom right bar is shorted to purple; based on that test I was pretty sure the switch was doing what it was supposed to... So now for the surprise: I was in a bit of a hurry (too many mosquitoes down here tonight!!), so I opted for scottyb's test: it would only take a couple minutes and would eliminate the F/R switch completely. I was stunned when I did the swap and suddenly had a (really fast!) reverse-only cart!! Ok, so it appears Sergio's hypothesis about an open in the yellow circled area is causing my problem; this brings up 2 more questions:
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08-16-2014, 12:54 AM | #12 | |
Guest
Posts: n/a
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Re: 91 Club Car: Forward Only, No Reverse
Quote:
yes you can take f/r switch apart and clean it... it might work look into a heavy duty from scotty b http://www.cartsunlimited.net/F_R_Switch_Upgrades.php |
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08-19-2014, 07:53 PM | #13 |
Not Yet Wild
Join Date: Aug 2014
Posts: 4
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Re: 91 Club Car: Forward Only, No Reverse
Ok, finally got a working cart today! And the correct answer was... We were ALL wrong! Turns out scottyb's test of swapping the 2 cables on the F/R switch eliminates the motor from the list of suspects; however, there's another part in the circuit (besides the F/R switch) that doesn't get used in that test: the (green in my case) cable from the middle battery (18V takeoff) to the bottom right lug on the switch!
I first took the switch apart and cleaned up all the copper and it looked fine, so before ordering a new one I hooked it all back up and started testing voltages again. I finally found I was getting 18V measured at the lug until I stepped on the pedal; then it dropped to 0 (still showed 18V at the battery end of that cable), so I guess the cable was corroded internally just enough to cause an open when trying to push all the amps through. Anyway, thanx for all the help from everyone and I hope this thread helps someone diagnose a similar issue in the future! |
08-19-2014, 08:31 PM | #14 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,183
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Re: 91 Club Car: Forward Only, No Reverse
A standard ohmmeter can't measure the low resistance you need for a motor circuit to work properly. You need to be able to measure miliohms. This is why most of this stuff has to be measured under a load. There are special low ohm meters available that incorporate a four wire system to eliminate lead resistance. Most of us don't have one.
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08-22-2014, 06:35 AM | #15 |
Gone Wild
Join Date: Dec 2010
Posts: 635
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Re: 91 Club Car: Forward Only, No Reverse
Good Info
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