06-03-2024, 10:45 AM
I have some ideas, but first I’d like to do some battery checks. Yeah, I know, you did some.
You said the resting voltage is 12.8v. Thats a good sign. Now with the meter on the battery, turn on the ignition. What is the voltage now?
Do you have a service manual? The manual says, and the wiring diagram shows, that the meter gets two 12v inputs. One is present all the time, and the other comes in when the ignition switch is turned on. The needles should sweep then. Could be an intermittent somewhere in the ignition 12v to the meter. It may be you have to open the meter and reseat/clean the connectors.
Why it works after started I don’t know yet. To me it indicates there isn’t enough voltage to operate the meter while under load but when the alternator comes up all is good. But then I wouldn’t expect the starter to have enough power to spin the engine but not drive the meters.
But one problem at a time. Check the voltage with ignition off, then on and tell us what the drop is.
You said the resting voltage is 12.8v. Thats a good sign. Now with the meter on the battery, turn on the ignition. What is the voltage now?
Do you have a service manual? The manual says, and the wiring diagram shows, that the meter gets two 12v inputs. One is present all the time, and the other comes in when the ignition switch is turned on. The needles should sweep then. Could be an intermittent somewhere in the ignition 12v to the meter. It may be you have to open the meter and reseat/clean the connectors.
Why it works after started I don’t know yet. To me it indicates there isn’t enough voltage to operate the meter while under load but when the alternator comes up all is good. But then I wouldn’t expect the starter to have enough power to spin the engine but not drive the meters.
But one problem at a time. Check the voltage with ignition off, then on and tell us what the drop is.