2nd Gen Non-Engine/Transmission Isspro EV2 Trans Temp Gauge Acting Up

[Silver Ratler]

I have been using an Isspro EV2 gauge to monitor my trans temps for the past few years... ... everything was fine until a few days ago! All of a sudden the gauge started acting very strange..... needle would go from 160 to 300, then back and forth a few times. Once in awhile it would peg out at the max then bounce back down.



Had the trans checked by my transmission shop and he said everything was fine with the actual trans temps. Checked with a couple of sources including Isspro, thinking my temp sensor had gone bad... ..... All said that it was most likely not the sensor, but the amplifier box. Ordered the amp box, installed new wiring from gauge to amp and from amp to temp sensor... ... Gauge still acting up! I have ordered a temp sensor that should be here later in the week..... that will be the last thing to change out, other than the gauge itself!



Anyone have any experience with these gauges acting up like this?

 

[HHhuntitall]

Yeah, unfortunately, I've found the EV2 series of gauges to be no more reliable than any other brand..... Their old mechanical gauges would run as long as a Cummins, but the EV2 is pretty problematic... . What you're describing to me is either in the sending unit or the wire clipping in the back of the head unit..... That's some of the crappiest connections I've ever seen..... You might try reseating the wires in the back of the guage itself... .

 

[ATClark]

For a gauge that used to work, then fails randomly, check to make sure that the gauge ground wire is connected directly to battery ground, i. e. it is not shared with any other electrical componets, as any stray ground current flows through the ground wire can upset the small voltages used by the temperature sensors.



Hope this helps.

 

[Silver Ratler]

For a gauge that used to work, then fails randomly, check to make sure that the gauge ground wire is connected directly to battery ground, i. e. it is not shared with any other electrical componets, as any stray ground current flows through the ground wire can upset the small voltages used by the temperature sensors.

Hope this helps.

I had already checked the ground... . but..... went ahead and ran an isolated wire to the battery... ... No effect, gauge is still acting up. At this point, everything but the gauge and sending unit are new, so guess I will be ordering a temp sensor. Thanks for the suggestion.

 

[Silver Ratler]

Yeah, unfortunately, I've found the EV2 series of gauges to be no more reliable than any other brand..... Their old mechanical gauges would run as long as a Cummins, but the EV2 is pretty problematic... . What you're describing to me is either in the sending unit or the wire clipping in the back of the head unit..... That's some of the crappiest connections I've ever seen..... You might try reseating the wires in the back of the guage itself... .

My gauge does not have the plug in connector on the back... . small studs with nuts. Checked all of those and doubled checked my connections on the amp box when I installed the harness... . still nothing..... as previously stated will be ordering a temp sensor as that is the last thing other than the gauge to be bad.

 

[cerberusiam]

Grounding ANY component directly to the battery is a good way to mess up the component and the engine control system. All add-on components need to run to a chassis ground or there is no way to tell what the issue is.

You the older EV series gauges if you have an amp box and studs on the back of the gauge. They are usually dead reliable as they are a grounded circuit. The only problems I have had with mine in some 6 years is contacts in the sending unit getting bad. Usually a srpay down with electrical cotnact cleaner and a little dielectric grease and it is good to go, unless the wires got pinched and are broken in the sheathing. . Took me a while to find that particular problem.

 

[HHhuntitall]

Grounding ANY component directly to the battery is a good way to mess up the component and the engine control system. All add-on components need to run to a chassis ground or there is no way to tell what the issue is.

You the older EV series gauges if you have an amp box and studs on the back of the gauge. They are usually dead reliable as they are a grounded circuit. The only problems I have had with mine in some 6 years is contacts in the sending unit getting bad. Usually a srpay down with electrical cotnact cleaner and a little dielectric grease and it is good to go, unless the wires got pinched and are broken in the sheathing. . Took me a while to find that particular problem.

Hey! Didn't even think of the wire pinched or stretched issue..... I had one a few back that had the wires pulled pretty hard at some point, I presume during a pump removal and install... . They worked fine for a while, but then the wires got hot and separated, giving the intermittent issue..... Just another suggestions... .

 

[Silver Ratler]

Finally got my new temp sensor from Isspro and installed it today... ..... Gauge now seems to finally be working! By the time it was all said and done, I replaced the amp box, wiring harness and the sensor... . everything but the actual gauge.

 

[jpogue]

Thanks for the info Silver. My isspro trans temp gauge has been doing the same thing lately but haven't towed anything so I put it on the low priority list. Now I know what to do