Have any of you run into this? I am not getting power to the fuel, oil pressure, and temperature gauges. My testing indicates that the Instrument Voltage Regulator (IVR) is working with its 5v pulse, the wires from the IVR to the gauges are working, there is 12v to the IVR, and there are no shorts to ground on any of the gauges. If one of the sending units (or one of their wires) shorts out, could this bring down all three gauges? This is very perplexing.
gauge power
make sure the gauges are grounded.ie one side is power from ivr the other is ground
gauges
oil presure gauge gets ground from op sender,fuel gets ground from fuel sender,temp.gets ground from temp sender.gauges that require power from ivr are all tied common...positive input...
gauge power
That's right. They all are tied in common to the IVR. I buzzed out the wires that come off the IVR, saw 12v going into the IVR, and saw the 5v pulse coming out of the IVR. So, I am wondering if I have a wiring problem coming off one of the sending units. If you measure the resistance across the terminals of each of the 3 gauges, you get about 12 ohms a piece. If one of the sending unit wires shorted, it seems like you would have a series resistance of 36 ohms which seems like it would shut them all down. Comments? Thanks!
gauges
discconnect one gauge at a time and see if the rest start working. possible wire from one sender has a solid ground,OR a bad gauge,,,,,
gauges
going wrong way!!!!! if gauges dont work at all...no indication....fuel, oil,temp,check to see if wire from ivr is loose or not making good connection at gauge multiple connection at gauge input. when ivr is connected to gauges,only fuel gauge will indicate when is turned to run pos.only.every thing else won"tcome on.
Don't forget the cluster faq
http://www.bronco.com/cms/node/1038
It has a troubleshooting section and some things to test.
And no, I haven't heard about a single sensor taking out the other gauges.
Power on the gauge pod
I eventually prevailed with getting my gauges to work, but it took a while. It seems like the main issue was intermittent power to the IVR (the little 5v pulse gadget on the pod). This caused some confusing readings with the IVR working sometimes, then later conking out. So, I did the following: I set up a test set for the IVR's I had with a 12v source and an analog meter. I managed to get an old IVR off of an F100 gauge pod that I got at a swap meet for $6. It worked and the other replacement IVR's I had didn't. I re-did the connector on the 12v supply wire to ensure solid contact. I think the fluctuating power was eventually destroying the IVR. Now the sucker works fine.