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| Joined: | 08-17-2007 |
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So recently I have been trying to tie up somethings left unfinished, after ten years of on going restoration projects. So I contacted Electromotive, Inc. again to see what could be done to get the tach. to work, & they told me they had just started marketing a Tach. amplifier, so altought it was rather expesive I purchased one since they assured me that was what was needed to make the tach work again.
When it arrived their was not any wiring diagram w/ it, just the color of the (4) wires noted on the Manufacturers label as follows; white = Input, black = Ground, green = Output, pink = +12v. So after several phone calls to their Technical support staff, & e-mailing a scanned copy of the J. H. wiring diagram, it was decided that the J.H. has a Current Triggered Tach. since the wire from the Tach went to the (+) side of the old coil & they told me it should be wired as follows; white = input to HPV-1 terminal marked tach., black = ground to body metal, green = output to tach. "NOT TO BE USED" cap off so wire will not ground to any metal, pink = to be connected to the (+) coil wire from the old tach. I told the technition when I had a mechanic install the HPV sys. he had also used the (+) coil wire for the wire coming from the ignition switch to the high current relay per the HPV wiring diagram, & questioned if that would create a problem since their installation manual stated not to attach anything else to the HPV power supply circuit. He assured me it would work that way to make the tach function.
So last weekend I worked on getting the Tach. Amp. & wiring set up with the HPV, but when I turned on the key the engine started, but no RPM's registered on the tach. . So after another call to the tech. rep. he told me it should have worked & if it did not I needed to install a new Tachometer since I had some kind of oddball tach. that was not reading the signal from the amplifier.
I told him a clubber had told me on the Message board, many moons ago, he had sent them his tach. & thay had modified it for him so it worked. So then he tells me to send in my tach. along w/ the new tach. amp. & they will look at the tach. to see if it can be modified & what the extra $ would be.
So I am hoping to find a club member that has Electomotive HPV sys. & managed to get the stock tach to work that can pass on some info. about the wiring. I still question the way I was told to set it up, but I don't know enough about automotive wiring to go any further.
Rob