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Thread: TR250 question (Not asking for a friend)

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    TR250 question (Not asking for a friend)

    I hold my hands up and confess my mistake; long story including bad weather, bad temper and little time cut short; I managed to put my new battery the wrong way round, fixed the negative pole to the positive cable, laid the negative cable on the positive pole, went to get a spanner and came back just a few seconds later noticing smoke coming from the alternator. Immediately removed the cable, obviously. Turned the battery around the proper way, cursed a bit, connected it and sat inside the car to try and start it. Noticed smoke inside the car as well. And the car was completely dead.

    No lights, no light in the alternator light in the dashboard, but no blown fuses and (hey!) the horn works.

    I have replaced the start solenoid and alternator. Is the ignition switch the next thing to suspect? Is there any way of checking this to make sure before I order a new one? Or is there any other culprit part to investigate first?

    Alright - I'm ready to take some punches, but also some good advice

    Thanks in advance,
    Karl

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    Re: TR250 question (Not asking for a friend)

    I did that 45 years ago and only melted a wire to the ignition. Also check your fusses. In general, reversing the polarity won't hurt much.

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    Re: TR250 question (Not asking for a friend)

    Might have fried the ammeter or a connection to it, or one of the wires connected to it. But we can only guess. I think you'll need to get a voltmeter or test light and probe around a bit to find where you are losing power; the source of the problem will then become obvious. I also doubt that there is much damage beyond the alternator and perhaps some wiring. The standard electrical parts, except the alternator, are not polarity-sensitive.
    Steve Maas
    1966 Triumph TR4A, undergoing restoration: http://www.nonlintec.com/tr4a
    1952 MG TD, restoration completed 2014, sold 2016: http://www.nonlintec.com/mgtd
    1960 Austin-Healey "Bugeye" Sprite, sold 2010: http://www.nonlintec.com/sprite
    1967 Porsche 912: http://www.nonlintec.com/porsche

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    Great Pumpkin TR3driver's Avatar
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    Re: TR250 question (Not asking for a friend)

    +1 on systematic troubleshooting, rather than replacing the entire electrical system.
    Ammeter is most likely IMO, but by no means the only possibility.

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    Re: TR250 question (Not asking for a friend)

    Thank you, guys - for advice and not telling me off I have ordered a new ignition switch and hopefully that does the trick. The next thing to obtain might then be an ammeter. The weather is such a mess in Norway at the moment, I wouldn't be taking the car for a spin, anyway (I keep telling myself).

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    Re: TR250 question (Not asking for a friend)

    Don't beat yourself up. I just did the same thing on my tractor even though I looked at the terminals to get it right. Us men and our attention span. Somewhere in moving it into the compartment I got it turned around. I bet you have some beautiful places to drive so I hope you the best.

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