Paul, I would like to see the details. Did you attached a temp sending unit to the motor? It may help to determine the signal type and level needed by the ZEVA.
________________________________ From: EV <ev-boun...@lists.evdl.org> on behalf of paul dove via EV <ev@lists.evdl.org> Sent: Thursday, October 27, 2016 4:30 AM To: Tom Keenan; Electric Vehicle Discussion List Subject: Re: [EVDL] Electronics help anyone I did this on my Celica. I can dig up the details if you want them. Sent from my iPhone > On Oct 26, 2016, at 7:59 PM, Tom Keenan via EV <ev@lists.evdl.org> wrote: > > I ended up replacing the bi-metal 'voltage regulator' with a solid state 7805 > (if memory serves) to provide voltage to the fuel gauge and the temperature > gauge (I use an OEM temp sending unit attached to the motor case). Works fine > with the ZEVA unit on the '89 style gauges. > > Tom Keenan > >> On Oct 26, 2016, at 3:33 PM, Cor van de Water via EV <ev@lists.evdl.org> >> wrote: >> >> Reason your resistor goes up in smoke at the end of the scale >> is that the display of the tank level takes quite a bit of power, >> the (cheap and rugged) way Ford did this was using a bi-metal to >> drive the needle and a *heater* to control the position of the needle >> by bending the bi-metal due to it getting warm. >> So, if it requires say 1/4 Amp at the minimum resistance of the heater >> then the resistor may need to be able to dissipate 2 Watts or burn up >> if it is too light... >> You should be able to drive the needle by outputting a voltage, probably >> the easiest is a PWM controlled output, with the duty cycle controlling >> the position of the needle. >> No resistors needed. But you are likely to see that the PWM must stay >> below >> about 50% duty cycle or it overheats the bi-metal (needle in the corner) >> so set the start (empty) and end (full) PWM limits accordingly. >> >> Success! >> >> Cor van de Water >> Chief Scientist >> Proxim Wireless >> >> office +1 408 383 7626 Skype: cor_van_de_water >> XoIP +31 87 784 1130 private: cvandewater.info >> >> http://www.proxim.com Proxim - Wireless Broadband, Backhaul Solutions and Access ...<http://www.proxim.com/> www.proxim.com Proxim Wireless offers licensed and unlicensed point to point, backhaul, bridge, point to multipoint, wireless broadband and wireless access points. >> >> This email message (including any attachments) contains confidential and >> proprietary information of Proxim Wireless Corporation. If you received >> this message in error, please delete it and notify the sender. Any >> unauthorized use, disclosure, distribution, or copying of any part of >> this message is prohibited. >> >> >> -----Original Message----- >> From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of ROBERT via EV >> Sent: Wednesday, October 26, 2016 3:21 PM >> To: Bill Collins; Electric Vehicle Discussion List >> Subject: Re: [EVDL] Electronics help anyone >> >> So. What does it matter? Did the PCM drive the gauge or did the tank >> sensor? Look at the vehicle wiring diagram. If the sensor came to the >> PCM, and the PCM output a signal to the gauge then you will never figure >> out the PCM signal type or level. The PCM is gone. Look at what you >> have at present .... a gauge and Amp transmitter and determine their >> signal requirements. Do not guess ... get the spec or you may damage >> the devices. >> >> >> >> ________________________________ >> From: EV <ev-boun...@lists.evdl.org> on behalf of Bill Collins via EV >> <ev@lists.evdl.org> >> Sent: Wednesday, October 26, 2016 11:33 AM >> To: ev@lists.evdl.org >> Subject: Re: [EVDL] Electronics help anyone >> >> >> The PCM probably had a resistor to a regulated voltage source, so that >> the tank >> sender produced a varying voltage instead of just a resistance. >> >> Bill >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> EV -- Electric Vehicle Discussion List - lists.evdl.org >> ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> >> lists.evdl.org >> The Electric Vehicle Discussion List is a forum for discussing the >> current state of the art and future direction of electric vehicles >> (EVs). 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