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Registered
Join Date: Feb 2003
Location: San Francisco, CA
Posts: 403
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Engine swap and now Tach doesnt work?!
I have been reading threads for hours but cannot seem to find my exact issue.
I have a 72 that had an 83 SC 3.0 in it. I did an engine swap last weekend for a ROW 3.0 from 1980. Everything works great except for the tach, which doesnt work at all. Turn signal lights and high beams seem to work, and it worked fine before, so I am not sure which step I am missing. I tried two CD boxes and both seem to work fine. I was told the new engine has an alternator with an external voltage regulator, but everything else is the same. I have checked for loose wires on the back of the tach but all seems to be fine. Any ideas? Anyone in the mill valley or SF area have a spare tach I can put in to make sure the tach hasnt gone bad? (although it worked fine last week). ![]()
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ROW '78 911 Targa
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Check tach pin out on the new versus old 14 pin connector. I believe it is pin 12 on the connector for the '80, may be different on the '83 to match the '72 chassis.
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Registered
Join Date: Feb 2003
Location: San Francisco, CA
Posts: 403
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Okay timmy2, what am I looking for?
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www.akalikoskateboards.com 72 3.0 RSR flared Targa |
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ROW '78 911 Targa
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Check the continuity from 6 pin CDI harness connector (middle black wire) on the new wiring harness goes to the same pin as the old one did on the 14 pin connector.
I'm out for Father's Day with my boy right now. I'll check back later. |
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Registered
Join Date: Feb 2003
Location: San Francisco, CA
Posts: 403
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Okay I took the covers off of each connector and I defintely see some differences.
Here is the old connector ![]() Here is the new connector ![]() Here is the pin box ![]() The wires are definitely in different spots for the old vs new harness. How can I tell what goes where? Thanks! Happy Fathers day!
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Registered
Join Date: Feb 2003
Location: San Francisco, CA
Posts: 403
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Yes thanks for the lead timmy! I rearranged the wires so they mimicked the old wires and now my tach is back!
This is great because now I can really wind the new engine out and actually know where redline is!
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www.akalikoskateboards.com 72 3.0 RSR flared Targa |
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ROW '78 911 Targa
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There ya go!
It's drive it like ya stole it time ![]() |
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