Re: Need suggestions - my amp gauge is acting like a tach
[Re: RM21N0A]
#1275695
07/29/12 12:37 PM
07/29/12 12:37 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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Quote:
And here is a picture at about 2,000 RPM:
Any ideas??
Your voltage regulator is fried (or maybe improperly grounded), so it's calling for full alternator output at all times. Don't drive the car (or rev it) until you get this fixed... will hurt your battery, bulbs, and possibly other electronics from overvoltage!
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Re: Need suggestions - my amp gauge is acting like a tach
[Re: CR8CRSHR]
#1275702
07/30/12 03:02 PM
07/30/12 03:02 PM
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Joined: Jan 2011
Posts: 492 Kansas
BEINGmeISaCRIME
mopar
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mopar
Joined: Jan 2011
Posts: 492
Kansas
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Quote:
Why not just by pass it all together using the MAD Electric upgrade. I will never again rely on the original for electrical status. It is the weak link for sure. Just do it and then add a Voltage meter and all will be good....
Probably the best thing I ever did to my coronet. Especially when I later upgraded to a 318 magnum with serpentine setup... the alternator on that would have fried everything if I hadn't done that upgrade already
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Re: Need suggestions - my amp gauge is acting like a tach
[Re: RapidRobert]
#1275703
07/31/12 08:02 AM
07/31/12 08:02 AM
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Joined: Jun 2005
Posts: 531 Virginia
RM21N0A
OP
mopar
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OP
mopar
Joined: Jun 2005
Posts: 531
Virginia
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The new VR (NAPA - Echlin brand - $29) came with a sheet that had this test:
Disconnect VR, connect jumper wire to FIELD side of harness that goes to the VR. Start car, watch amp gauge while grounding the jumper wire momentarily. Needle should jump to the right, if it does not, problem is somewhere in the wiring.
Needle moved to the right, so that was good.
Also, I checked and re-checked all the wiring, and could not see any problems anywhere.
Installed new VR, started car, revved engine, needle pegged to the right, then settled down to around +10 to +15 and stayed there, so I don't know, maybe it's OK now. But the needle used to just stay steady slightly to the right of zero.
One other possible clue I should have mentioned, when I start the car the temp gauge spikes to the right for a second, then goes back to normal. Has been doing that off and on for years, but does it more here lately.
I'll play with it some more this weekend and remove the instrument cluster to check the back, but still would like to hear any more ideas.
I also like the idea of the MAD conversion. I looked into that a couple of years ago but didn't get around to buying the stuff and doing the install. I'm exploring Mark's site (madelectrical.com) but cannot find exactly what I remember from when I read up on it before. Do you have a link?
I thought there was something in moparts Tech Archives about the MAD conversion but could not find it there either.
Thanks to everyone for all of the ideas so far.
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Re: Need suggestions - my amp gauge is acting like a tach
[Re: buildanother]
#1275704
07/31/12 03:55 PM
07/31/12 03:55 PM
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Joined: Dec 2003
Posts: 4,951 northwest USA
NANKET
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master
Joined: Dec 2003
Posts: 4,951
northwest USA
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Quote:
Or your battery is low on charge.
The voltage monitors system voltage. It recharges the battery and runs all the electrical components while the engine is running. First thing is to check you battery, how old is it, is it still good, meaning will it take a charge? Make sure it is charged, if you have been starting the engine many times the battery could be low, that is the biggest draw on a battery. Also check your battery cables, clean posts, ends, snug clean and dry connections on both ends of both cables. Then check out the bulkhead connector, same as battery connections. These things are important on all cars elec systems.
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Re: Need suggestions - my amp gauge is acting like a tach
[Re: NANKET]
#1275705
07/31/12 04:36 PM
07/31/12 04:36 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I'd slow charge the batt overnight & see if the needle is slightly to the right like it was way back. If not I'd take off both field wires from the alt and the connector from the reg & with jumper wires with alligator clips on both ends jump 12V from the batt positive post to one of the alt male field terminals and to the reg "top blue wire" male terminal and jump from the other reg "side" male terminal to the other alt male field terminal & jump from the reg case to the batt neg post & see if you're good at a fast idle. If so that tells you the hard components (alt/reg/batt) are good & the problem is in the wiring/grounds. The Madd upgrade has it's good points but if the overcharging ain't dealt with 1st the overcharging will fry something in the system & you'll see 15-16 volts on a voltmeter as opposed to the ammeter pegging. What Nanket said, clean the connections especially the bulkhead & reg ground after you've verified the batt is topped off & see where you're at
live every 24 hour block of time like it's your last day on earth
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Re: Need suggestions - my amp gauge is acting like a tach
[Re: RapidRobert]
#1275706
09/09/12 04:35 PM
09/09/12 04:35 PM
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Joined: Jun 2005
Posts: 531 Virginia
RM21N0A
OP
mopar
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OP
mopar
Joined: Jun 2005
Posts: 531
Virginia
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Thanks RapidRobert and everyone else - I haven't had time to do everything suggested, but the problem seems to have gone away. The battery is still real strong (only about 2 years old). I checked carefully for shorts and cleaned all of the connections when it first happened - battery, VR, bulkhead, etc., but I didn't think that solved the problem at first. Since then though, with short test drives it has not acted up. So I took I just took a nice 60-mile cruise, and everything was great. I'll be keeping an eye on it, and will keep you posted if it happens again.
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