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Jarvo2

240z alternator upgrade (instructions w/ pictures)

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    Relay photo 4.jpgOld thread but still valid. Here's four photos of the relays on my '73 that Dave asked for in 2015. I'm doing the alternator upgrade and have Dave's adapter from MSA. The alternator is already installed on my new motor which is still in it's crate. R&R Friday.

    I have no idea which one is the fuel pump relay or which wire to cut.

    relay photos 4.pdf

    Edited by Stanley

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    I found a diagram of the '73 relays in a modification bulletin. The fuel pump relays are "A" lower left, and "B" lower right. I see a yellow wire coming out of the harness connector, don't know if that's the one you're supposed to cut.

    FuelSystemMods73P11C.jpg

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    Also wondering about the stock ammeter with the upgrade. Seem to remember something about it not working but don't know if that is correct.

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    If the stock electric fuel pump on my '73 is removed do I still need to cut that elusive yellow wire ? I'll take a look in the car tomorrow but looking at the photos I posted, including the PDF's,  I don't see any yellow wire coming out of harness B (the one at the relay nest).  The instructions show how to hook up a electric pump but I'm not doing that now, maybe someday.

    Don't want to go nuts with the wire cutter, chopping every yellow wire I see.

    Before I removed it, the stock electric pump was disabled somehow with the wiring. It was hooked up but didn't run. When I removed it and checked it by touching leads to the battery, it ran.

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    On 5/22/2019 at 9:09 PM, joeybricks said:


    Hi Dave, could you re-share the instructions posted on this thread for the 73 240z ? I tried to open it but it’s not available.

    Any help provided would be greatly appreciated!

    Did you ever receive this link?

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