There is a soldered resistor that connects between the power wire from fuse #5 to the ground side of the voltage limiter. The voltage limiter feeds power to the fuel and temperature gauges. The resistor is marked with a single red stripe which I'm at loss to decode from a color code chart. The resistor is marked 47Ω ±20%, 11 watts. Doing a little arithmetic that would mean there's a constant draw through this resistor of ~0.25 amps. The resistor on my piece is a dead short so I'm inclined to replace it but I'm not sure I understand everything I know. Can anyone confirm any of this?
Printed circuit board, voltage limiter, resistor
- Thread starter Tool.Man
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67Dart273
Well-Known Member
LOL that is not a resistor. I cannot tell from the crappy print whether it's supposed to be a .47 (likely) or .047 uf (microfarad) 200V capacitor. That is to both stabilize the IVR and to prevent popping static in the radio. The original cars had one that resembled the RF suppression cap on the coil + connection.
How about some additional photos that show the location etc.
bcschief
Well-Known Member
How about a year make and model.
1976 Dart Swinger 318 auto.
Well...excuse my dumb @ss...your absolutely correct. I didn't study my own photo. It measures .51µF which falls within the ±20%. There is no problem although I'm not sure why it's there. Maybe it smooths the DC feed to the two gauges. The red stripe marks the positive end. Duh.
Whether it's OEM or someone added it on I don't know.
But the IVR works a bit like a blinker module.
A heater element causes the contacts to open and close at a rate dictated by the load on the IVR
When the points open or close there is a bit of a spark and that makes noise that would be heard on the am radio.
Also the spark erodes the contact points each open close cycle.
The capacitor acts like a shock absorber for the contacts and allows them to last longer when reducing the noise created.
67Dart273
Well-Known Member
I explained it earlier and so did Dana. It's a filter mostly for the IVR. The originals as he said, work like a flasher. So it's a switch "popping" on and off, making noise in the radio. It also acts to somewhat stabilize the IVR voltage
So far as I know, all Mopars came with a filter, but I have never seen one like that, AKA probably not OEM. The only ones I have seen look like a distributor condenser, or the one on the coil which is for same reason AND ALSO to provide a low impedance for the coil pulse.
So far as I know, all Mopars came with a filter, but I have never seen one like that, AKA probably not OEM. The only ones I have seen look like a distributor condenser, or the one on the coil which is for same reason AND ALSO to provide a low impedance for the coil pulse.
Looked at a 76 dart cluster and it does have the capacitor soldered to the circuit board. Chrysler used the same circuit board #2271222 for many years but in 76 a new board was used #3593534.
A new circuit board had to be purchased to get the capacitor. 1976 reproduction boards are being produced now but they don't include the capacitor.
A new circuit board had to be purchased to get the capacitor. 1976 reproduction boards are being produced now but they don't include the capacitor.
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