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Need wiring diagram for a 1989 toyota dyna 7ton tipper model MDDTQ as i cant get the altinator to charge batteries and there is output from altinator but not quite sure the correct voltage or how to check it properly. THANKS FOR YOUR TIME AND HELP. Paul

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Go to toyota.com...they have maunauls u can order

Posted on Aug 10, 2008

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Look for a loose output wire and connection. If the connection is loose dnd making and braking contact, it will blow the alternator. Also check the alternator ground, making sure it is not making and braking contact. The ground is the attachment to the engine bracket. You may have to add a large black wire from the alternator to the engine frame.

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Hey Steve, if you need a jump to start it then every thing is working except battery holding power try putting battery on a SLOW charge for a day then try again when its running check output of altinator with a fully charged battery it should be 12.5-13.5 volts and rise when you rev motor up ,when you jump it im thinking the battery is very low and the altinator is trying to recharge battery and it cant do that in just a few minutes running time or take it on along ride and watch amp gauge .good luck Steve.
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Sounds like a later model with computer controlling the output and this is faulty ,now one of the wires on the back is for the warning light in the dash so disconnect one of these thin wires at a time to locate the warning light control ,then refit the warning light wire and disconnect the other other one ,now what you do is to run another wire from this terminal to a 12v ignition switched feed in teh fuse box wrap wire around leg refit fuse and with engine running disconnect battery and it should keep running if its working ok as the alternator is now battery sensed and not computer controlled ,easy just like an older car without all this fancy electronics which can and does go wrong

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