jasonf Posted May 24, 2010 Share Posted May 24, 2010 hi silly question num 1 i have just swapped my engine for a 2.8 tdi isuzu now do i have to connect the alternator before it will start of will it fire up before connection also if the answer is no can anyone tell me the wiring conections for the alt ,i have 2 brown wires and one other from the original wireing loom on a mod 110 86 model and o idea what i needto connect on the alt itself many thanks anyone who helps me get it started will win a six pack of beer jason Quote Link to comment Share on other sites More sharing options...
Les Henson Posted May 24, 2010 Share Posted May 24, 2010 Most engines will start with the alternator not connected to the wiring, but be aware that the 2 brown wires will be live direct from the battery. Engine will run on the battery for quite some time, especially diesels. The two large brown wires will be for the charge/supply circuit, and connect to the largest of the alt terminals (13mm nut). The thinner wire will be the exciter/charge indicator wire, and usually connects to the smaller alt terminal - 8 or 10mm nut. Les. Quote Link to comment Share on other sites More sharing options...
jasonf Posted May 24, 2010 Author Share Posted May 24, 2010 thanks les the 2 brown wires i think go on to a large spade connector as my friends does ,do they need to be connected to the alt first as they do spark when brushed across the alt body with ign on! Quote Link to comment Share on other sites More sharing options...
Briarston Posted May 24, 2010 Share Posted May 24, 2010 Personally, I wouldn't run the engine with the alternator disconnected, unless the drive belt was removed. It always used to be reckoned that doing it would cause the alternator to self destruct, trying to charge against no resistance. However, I don't know for sure, but it MAY be an expensive way to find out! Quote Link to comment Share on other sites More sharing options...
jasonf Posted May 24, 2010 Author Share Posted May 24, 2010 point taken i will connect the 2 brown wires and see how that goes Quote Link to comment Share on other sites More sharing options...
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