Battery Gauge going from 15 to 18
Thread Starter
Junior Member
Joined: Sep 2009
Posts: 63
Likes: 0
From: new hampshire
Car: 1986 Z28
Engine: 305
Transmission: T5
Axle/Gears: 4.11
Battery Gauge going from 15 to 18
The amp gauge will sometimes read at 15, then jump to 18 and stay there, and go back down, and up, and the lights in the car go brighter and dimmer. Does anyone know what could be causing this?
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Jello Voltage
Does it happen only at idle?
Does it happen at higher RPM?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
Does it happen at higher RPM?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going Backwards
When you see fog or “running” lights on in good weather beware. WLow performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime
and the nitwits that need headlights for a little rain
.
.
If People Drove Any Slower They’d Be Going BackwardsWhen you see fog or “running” lights on in good weather beware. WLow performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime
and the nitwits that need headlights for a little rain.
.
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Jello Voltage
About the voltmeter reading up to 18, that might be an inaccurate gage, which you can verify with a test instrument quality voltmeter.
If the voltage really was 18 you have a bad regulator in the alt.
You’ve probably looked at or cleaned & tightened every connection you could think of.
To find out where the problem is you can setup a balanced voltmeter monitor.
You can use a +3/▬3 zero center meter.
Connect one lead to the alternator output, connect the other lead to the input of any of the lights that are dimming.
Now, if there the deflection is a fraction of a volt the alternator output is varying.
If the deflection is a volt or more the bad connection is between the alternator and the light.
You can then remove the test lead from the light, move it closer to the alternator on different connections.
When the deflection drops to less than half a volt you have localized the bad connection.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
If the voltage really was 18 you have a bad regulator in the alt.
You’ve probably looked at or cleaned & tightened every connection you could think of.
To find out where the problem is you can setup a balanced voltmeter monitor.
You can use a +3/▬3 zero center meter.
Connect one lead to the alternator output, connect the other lead to the input of any of the lights that are dimming.
Now, if there the deflection is a fraction of a volt the alternator output is varying.
If the deflection is a volt or more the bad connection is between the alternator and the light.
You can then remove the test lead from the light, move it closer to the alternator on different connections.
When the deflection drops to less than half a volt you have localized the bad connection.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going Backwards
When you see fog or “running” lights on in good weather beware. WLow performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime and the nitwits that need headlights for a little rain
.
.
If People Drove Any Slower They’d Be Going BackwardsWhen you see fog or “running” lights on in good weather beware. WLow performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime
and the nitwits that need headlights for a little rain.
.
Thread Starter
Junior Member
Joined: Sep 2009
Posts: 63
Likes: 0
From: new hampshire
Car: 1986 Z28
Engine: 305
Transmission: T5
Axle/Gears: 4.11
Re: Jello Voltage
Well awhile ago a guy did test something my car, and for some reason he took readings on my altenator and said it was a little low (rpms?) but should be okay. Maybe it went lower? What are all the connections I should tighten up? (Sorry I'm car retarded)
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