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Ammeter stuck at zero

fstblk66

Well-known member
Joined
Feb 17, 2005
Messages
45
Location
Garage kept
Corvette
66 coupe,72 vert,
Recently got stranded temporary due to a failure of the battery. Once back to the garage upon completing an inspection of the battery noticed very slight swelling of battery. purchased new battery and started car however I noticed that the ammeter gives no reading and is stuck at zero (middle) even upon accelerating. Car has a fairly new voltage regulator, could it be the alternator , toasted ammeter or the charging system. Please help
 

Rob Musquetier

Active member
Joined
Apr 3, 2006
Messages
41
Location
Netherlands
Corvette
1959, 1963 SWC, 1969 Conv, 1999 Coupe
Do you see any decharging when lights are on (or other current suckers)? If not it is likely your guage is gone...

greetings,
Rob.
 

fstblk66

Well-known member
Joined
Feb 17, 2005
Messages
45
Location
Garage kept
Corvette
66 coupe,72 vert,
Not a budge from the guage no matter what is turned on , lights, wipers, radio, signals.
 

Rob Musquetier

Active member
Joined
Apr 3, 2006
Messages
41
Location
Netherlands
Corvette
1959, 1963 SWC, 1969 Conv, 1999 Coupe
Then it must be the gauge, it should indicate both charging (+) and dis-charging (eg when lights are on and engine isn't running).

greetigns,
Rob.
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
Chances are it just has a bad contact inside the inboard multiple connector on the engine side of the fuse block; the battery gauge has two wires, both of which go through that connector - 20-ga. black that goes to the big stud on the starter solenoid, and 20-ga. black/white that goes to a screw connection on the horn relay. See this frequently.

DashConns.jpg


:beer
 

fstblk66

Well-known member
Joined
Feb 17, 2005
Messages
45
Location
Garage kept
Corvette
66 coupe,72 vert,
I have cleaned both connectors with small brush, still no reading
 

LVMYVT76

Well-known member
Joined
Apr 21, 2006
Messages
664
Location
springfield, mo
Corvette
1976 medium blue
dod you check and see what voltage is going to battery??? voltage reg may be putting too much out since old battery was swollen. Sounds like overcharging to me, but need facts. I had a car that the guage did not work until I changed out the motor wiring harness and lighting harness, so in the wiring may have gone bad with the battery problem. Need a wiring diagram to check out.
 

magicv8

Well-known member
Joined
Mar 18, 2003
Messages
656
Location
Going too fast over the hill.
The battery meter is not an ammeter. It reads the slight voltage differences between the horn relay (black with white stripe) and the starter solenoid (black on large post). Both wires provide battery current to the meter contacts at all times.

See the diagram at the bottom of this web page:
http://www.corvetteforum.net/classics/magicmachine/index5.shtml

The meter can be protected by a 1 or 2 amp fuse connected to either meter lug (post/contact). If unprotected, a grounding of either feed wire will toast the meter. (You can fix it if you take it apart.) To install a fuse, put 1 male and 1 female spade lug on a fuse holder. Insert the female end in the plastic meter connector in place of either wire, and connect the other end to the wire you removed from the connector - as shown in the following photo:
http://www.corvetteforum.net/classics/magicmachine/apic5/fused_batmeter.jpg

To test the meter unplug the connector and connect a 9volt dry cell in its place. If the battery meter does not move, remove it and fix it AND the wiring problem that fried it.

ALWAYS disconnect the battery when working on wiring.:mad

PS: C1s do have ammeters. 67 wiring harnesses have fusible link protection at the starter and the horn relay. IMO neither link will protect the meter.
 

rowingone

Well-known member
Joined
Dec 2, 2003
Messages
221
Location
colorado
Corvette
1964 conv
You say you can fix it if you take it apart . . . what is required once its apart to repair it?
 

magicv8

Well-known member
Joined
Mar 18, 2003
Messages
656
Location
Going too fast over the hill.
You say you can fix it if you take it apart . . . what is required once its apart to repair it?
On most failed meters, you will see a spot on the wire wrap that's burned though. You can solder a small piece of wire across the break and dab liquid insulator on it, or you can unwind one wrap and solder the ends together then dab.
 

rowingone

Well-known member
Joined
Dec 2, 2003
Messages
221
Location
colorado
Corvette
1964 conv
thanks . . . that's the easy part I guess . . getting out of the cluster . . I hate that part!
 

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