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Technical Support / Re: 1998 Patriot dash gauges dead
« Last post by Eric Maclean on April 25, 2024, 02:08:23 AM »Dennis
Each of the gauges in the dash are feed 12+volts to the I terminal on each gauge this power is daisy chain from one gauge to the next.
Each gauge also has a ground connection on the G terminal on each gauge daisy chained from one to the next.
With the dash out check between the I terminal and the g terminal with a volt meter and the ignition turned on it should read battery voltage if you have a 12 volt reading the voltmeter should read 12 volts
First using a volt meter to read the voltage between the ground buss bar and the ignition solenoid with the ignition turned on check the voltage on both sides of the solenoid ( large studs) your are looking for a volt drop across the solenoid if there is more than a volt difference from one side to the other the solenoid is bad .next take a volt reading at both sides of the circuit breaker for the gauges if they aren't the same as at the solenoid the breaker is bad.
If the breaker is cycling on and off you may have a short circuit in the gauge feed circuit causing the breaker to cycle ( shorted wire or gauge)
If no 12 volt reading between the I and g terminal on the gauges start by running a jumper with directly from the ground buss bar in the electrical bay to the G terminal and do your test again.to verify weather it's a ground problem or supply problem if you still have no 12 volt reading move your jumper wire to the I terminal and connect the other end to the ignition side of the ignition solenoid in the electrical bay.to verify the gauges read correctly
Sorry for the long winded instruction I hope it helps you determine where to look for your fault
Eric
Each of the gauges in the dash are feed 12+volts to the I terminal on each gauge this power is daisy chain from one gauge to the next.
Each gauge also has a ground connection on the G terminal on each gauge daisy chained from one to the next.
With the dash out check between the I terminal and the g terminal with a volt meter and the ignition turned on it should read battery voltage if you have a 12 volt reading the voltmeter should read 12 volts
First using a volt meter to read the voltage between the ground buss bar and the ignition solenoid with the ignition turned on check the voltage on both sides of the solenoid ( large studs) your are looking for a volt drop across the solenoid if there is more than a volt difference from one side to the other the solenoid is bad .next take a volt reading at both sides of the circuit breaker for the gauges if they aren't the same as at the solenoid the breaker is bad.
If the breaker is cycling on and off you may have a short circuit in the gauge feed circuit causing the breaker to cycle ( shorted wire or gauge)
If no 12 volt reading between the I and g terminal on the gauges start by running a jumper with directly from the ground buss bar in the electrical bay to the G terminal and do your test again.to verify weather it's a ground problem or supply problem if you still have no 12 volt reading move your jumper wire to the I terminal and connect the other end to the ignition side of the ignition solenoid in the electrical bay.to verify the gauges read correctly
Sorry for the long winded instruction I hope it helps you determine where to look for your fault
Eric