just added new consol gauges in my 67(not factory), everything works except the amp gauge is acting funny, with the key on the gauge is centered or there abouts, with the engine running the gauge reads far right, I have a internal reg alternator if that makes any difference and the alternator sits on the pass side on a newer engine install, the charging wire is connected to the horn buss bar relay then feeds back to the battery post,I have a factory gauge conversion harness that put the amp wires in the correct locations, blk wire to battery post,blk/white wire to horn buss bar relay,I searched and need more help
thx scott

How big is your charging wire? If its not the same gauge as the original (12AWG I think) that will throw the gauge out of calibration smaller wire will make the guage swing more, larger wire will make it swing less. If you have any loads directly connected to the positive terminal of the battery, like an electric fan relay that will draw more power thru the charging wire towards the battery and will look like the battery is charging, when in reality the power is going to that load.

thx for the reply, I do have a msd 6al connected to the battery post, located behind the battery and I put a larger charging wire in also because of the internal reg alt that is 63 amps, if this is the problems what are some possible fixes? , could i move the charging wire to the battery post?, also I have the wire diagrams 10 ga red on the charge wire.
thx scott

As Mark suggests, having loads tied to the battery post will make the ammeter read more as the load is requesting power; more current, more positive swing of the meter.

The OE ammeter is a millivoltmeter and connected between the horn relay buss bar and the junction block next to the battery. Ten gauge wire is the OE design between these two points as well as the rest of the power distribution.

I would suggest to move the MSD power source from the battery post to the buss bar. This action would leave just the battery in this line of current and would hopefully allow the ammeter to read correctly.

I will move the msd power lead and post what happens
thx scott

last night I moved the msd's red wire down to the horn relay's buss bar(was on the bat post)
the result was the amp gauge was no longer peged to the right, it was one line from center towards the right, the remaining offcenteredness is problee the bigger charging wires I added, I am ok'y with the gauge reading the way it is now and will probllee leave it since all my wires are rapped in the looms, unless there is a reason the gauge needs to be centered while running? Thx for the help!!!!!:hurray:
Scott

Mine is always about 1 needles width to the right with the engine running. Starts out one or two lines to the right after cranking (depending on how long it takes to start) and then gradually settles back to that needles width to the right. Just indicates there is a higher voltage at the voltage regulator terminal and it may be putting a small charge into the battery at all times. Its hard to tell because as a battery comes up to charge its internal resistance changes, so the charging current drops off for any given voltage.