Battery meter reading off

Grinds6

I installed Scottyb's digital battery meter in my 04 Precedent with the 4-12v setup. The batteries were 08 or 09, so they were older. It seemed as though the reading on the meter was correct. I made the switch over to the 6-8v setup and installed new Trojan T-890 batteries. I ran the cart up and down the block a few times and then put it on the charger. I checked it the next night and the meter read 49.6, not close to the 50.9 I was expecting. I ran it up and down the block again and plugged it back in yesterday afternoon. I checked it this afternoon and it read 49.5. I then got out my handheld digital meter and the reading was 50.7. I should add that my digital meter on my cart is hooked up to the keyswitch so when the key is ON the meter is ON.
My question is has anyone else had this issue with their meter? Did you find a solution? Anyone have any suggestions?
Thanks in advance!

BGW

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Sergio

That may be the right voltage at the switch... The 2004 precedent manual shows a diode in series with the power feeding the switch (from solenoid red wire - diode - blue wire). Most diodes have between .7 and 1.2 forward voltage drop... What does your meter read if you measure at the back of the SOC meter?

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jfcody3962

mine seems to work well.

Grinds6

Sergio: I will check that this afternoon and see what the results are.
jfcody: Do you have yours hooked up to the key? or is it always on? seperate switch?

Thanks!

jfcody3962

mine is connected straight to the battery pack (fused and on a switch)

jfcody3962

separate switch that is

crash test dummy

wired to 3 way switch .. exact readings for both 12v and 36v

scottyb

Some key switches offer as much as .5v resistance.

If you test and find this to be the case you can just compensate what you are reading or find a better source.

jakesnake27

If you want the true reading with no resistance at all, connect black to main negative on pack and red to main positive on pack. It will always be on, but there will be no resistance from switches, etc.