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> Electrical Issue After Engine Drop
HerdofCrickets
post Aug 12 2019, 12:20 PM
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Dropped the engine last fall, had it rebuilt and we put it back in a month or so ago.

After having a little boy a few months ago, I'm finally getting a little time to get back to work on the 914.

Engine itself runs great, exhaust is really rich... so I guess the carb needs adjusted a little.

One issue though... no power to the dash (tach doesn't work and radio doesn't turn on).

Also when I turn the key, the engine tries to turn over but only fires when you let off the key.

Pretty sure I must have a wire hooked up wrong...

I'll start working backwards tonight but if anyone has any ideas... that'd be fantastic!

-Jon
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76-914
post Aug 12 2019, 02:06 PM
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QUOTE(HerdofCrickets @ Aug 12 2019, 11:20 AM) *

Dropped the engine last fall, had it rebuilt and we put it back in a month or so ago.

After having a little boy a few months ago, I'm finally getting a little time to get back to work on the 914.

Engine itself runs great, exhaust is really rich... so I guess the carb needs adjusted a little.

One issue though... no power to the dash (tach doesn't work and radio doesn't turn on).

Also when I turn the key, the engine tries to turn over but only fires when you let off the key.

Pretty sure I must have a wire hooked up wrong...

I'll start working backwards tonight but if anyone has any ideas... that'd be fantastic!

-Jon

I had that same experience with the ignition switch. Put a new battery in and that did the trick. What kind of voltage are you seeing at the battery. Is the blk wire w/ purple stripe connected at the coil?
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HerdofCrickets
post Aug 12 2019, 03:22 PM
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QUOTE(76-914 @ Aug 12 2019, 03:06 PM) *


I had that same experience with the ignition switch. Put a new battery in and that did the trick. What kind of voltage are you seeing at the battery. Is the blk wire w/ purple stripe connected at the coil?


Black wire with purple strip is not connected; reading the wiring diagram it looks like that is for the tach... so that makes sense. I read that it goes to the negative side of the coil; can someone confirm? I've already fried that little chip inside the distributor twice (IMG:style_emoticons/default/smile.gif)

Not sure how to check battery voltage; i'll have to google that and respond when I get home later.

I was thinking I had the ignition wire on the circuit board plugged into the wrong slot, I need to check... I think it's plugged into slot II (bottom left of this diagram) but need to confirm and read the difference between Slot IV and Slot II


https://imgur.com/a/RjFnTXr



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ClayPerrine
post Aug 12 2019, 05:24 PM
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Black with purple wire goes to the negative terminal on the coil.

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Mike Bellis
post Aug 12 2019, 10:02 PM
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Bad tranny ground.
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HerdofCrickets
post Aug 13 2019, 07:09 AM
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QUOTE(Mike Bellis @ Aug 12 2019, 11:02 PM) *

Bad tranny ground.


Thank you! I would not have checked that. Will check tonight.
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HerdofCrickets
post Aug 13 2019, 11:12 AM
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QUOTE(Mike Bellis @ Aug 12 2019, 11:02 PM) *

Bad tranny ground.


Would a bad/poor tranny ground also cause the red 'charging system error' light on the dash to light up?

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Chi-town
post Aug 13 2019, 12:31 PM
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Yes as the alternator is grounded to the engine, not the chassis so you need the strap
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HerdofCrickets
post Aug 13 2019, 01:39 PM
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QUOTE(Chi-town @ Aug 13 2019, 01:31 PM) *

Yes as the alternator is grounded to the engine, not the chassis so you need the strap


I ran home over lunch and checked; I did re-attach the strap under the car by the transmission ...

I'll take it off tonight, clean it up, and re-attach.
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