Dead TR. Need help! | FerrariChat

Dead TR. Need help!

Discussion in 'Boxers/TR/M' started by campbell360, Apr 22, 2021.

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  1. campbell360

    campbell360 Formula Junior
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    #1 campbell360, Apr 22, 2021
    Hi all....I'm not much of a mechanic so this is stumping me. Over the winter I pulled the circuit board and sent it in for an update. Turns out it was already done so they sent it back. I replaced all the relays with updated versions as all of them seemed OE. I put everything back now the car is dead. New battery so that's not it. A test light clipped to the neg battery cable and touching the positive has no light. So there appears to be a major ground issue. Where should I start? Thanks for any advice.
     
  2. OptimusPrime

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    #2 OptimusPrime, Apr 22, 2021
    Do you have a battery tester? If it is new it will test good in or out of the car regardless of the ground wire (unless you are testing on the battery contact and the connection to the battery is loose, wet, or corroded). What is test light rated for? If it is for 120V AC, It will not light up. If battery is OK, then check the battery switch turned off (under hood by battery). Then report back
     
  3. carguy

    carguy F1 Rookie

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    #3 carguy, Apr 22, 2021
    So you put a test light across the negative and positive battery terminals and "no light"....? If you used an automotive test light...then I'd say the battery is the problem.
     
  4. EZORED

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    #4 EZORED, Apr 22, 2021
    Did you turn on the power switch above the battery? in the front luggage compartment. Optimus already addressed that!
     
  5. turbo-joe

    turbo-joe F1 Veteran

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    #5 turbo-joe, Apr 22, 2021
    as I understand you put the test light to the negative cable ( where ?) and the positive ( also where? )
    if you go directly on the battery and the light is off then the light is broken or the battery empty
     
  6. campbell360

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    #6 campbell360, Apr 23, 2021
    Thanks everyone for their input. I may not have described what I did very well. 1) I just discovered there even was a battery kill switch. It has been in the "on" position the entire time. 2) I was told to unhook the negative battery cable and attach the test lite to it. I then touched the positive terminal on the battery. No light. Thus being a 'grounding' issue? I truly am at a loss as to what happened since what I did to the car was pretty minimal and it ran fine when I put it away for the winter (on a trickle charger like all my other cars).
     
  7. Steve Magnusson

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    #7 Steve Magnusson, Apr 23, 2021
    Certainly "cycle" the battery kill switch a couple of on-off-on cycles to wipe the contacts. If no joy, confirm your test light does illuminate:

    1) when touching the two battery terminals,
    2) with one side touching the positive battery terminal and the other side touching the ground wire on the RH front bonnet latch,
    3) with one side touching the negative battery terminal and the other side touching a terminal in the unplugged large red wire that normally is connected to the d and e terminals of the fuse-relay panel.

    If it doesn't illuminate in one of those tests, it can give a clue about where to look. Also, have you checked/tightened where the d&e red cable attaches to the stud on the positive battery terminal?
     
  8. OptimusPrime

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    #8 OptimusPrime, Apr 23, 2021
    That is not correct, light will not light as you describe test. Touch light to positive and negative battery and verify it lights to verify battery is good. Next touch light to positive post on battery and then to metal on frame while both cables are connected to battery. If it does not light you have ground issue. Report back
     
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  9. OptimusPrime

    OptimusPrime Formula Junior

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    #9 OptimusPrime, Apr 23, 2021
    What Steve said;-)
     
  10. campbell360

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    #10 campbell360, Apr 23, 2021
     
  11. carguy

    carguy F1 Rookie

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    #11 carguy, Apr 23, 2021
    Down on the lower frame rail under the engine is a "quick-disconnect" for the positive power cable - check to see that is also okay.
     
  12. campbell360

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    #12 campbell360, Apr 23, 2021
    Thanks guys. I did get it going. I'm embarrassed to say that the hot cable to the circuit board was not connected. I did everything so long ago to send out the board that I forgot there was another cable to connect. Started right up. Sorry for the trouble. And thanks for the help.
     
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  13. turbo-joe

    turbo-joe F1 Veteran

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    #13 turbo-joe, Apr 23, 2021
    when you unhook the negative battery cable and attach the test light to it where you put the other terminal from the test light? you have no closed loop to the battery so the light can not go on

    good that you found the mistake with the not connected wire
     

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