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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [XJ6 s3 4.2] Non-starter - Part 5
[ Randy Wilson <randy@taylor.infi.net> ] | | >A simple test that I apply is to turn on the headlights. If there is good | >juice you should get reasonable lights. Watch the lights while someone | >turns on the starter. | | The real test is with a VOM (volt meter) with aligator clips on the leads. | YOu need to have over 8 volts for the starter to function; preferably | well over 8, like 10 or 11. This is with the motor activated. Ok, Randys put together the most comprehensive checklist, so I've just been outside and worked my way through it (I hope). I'm pretty much in the dark as to what the readings mean, but here goes: Measuring conditions: Don't have any aligator clips, so probes were jammed in place where possible. Also, car door was open. | Set the meter in the windshield, propping it with a wiper blade, such | that you can read it from the drivers set. With each test connection, | key the starter and read the voltage. We'll move the probes around to | isolate the bad connection/component. | | Meter connected to battery. Less than 8 volts, bad/discharged battery. stop. | 10-12 go on. 12.8 V | Meter connected negative to starter (mounting bolt is good), positive to the | lower big lug of the solenoid; actual power into the motor. 10-12 means | bad starter (stuck brush). Stop. bvelow 8, go on. 0 V | Move positive to small screw wire (field wire). below 8 volts, bad relay, | neutral switch, ign switch. 10-12 go on. 12.7 V | Move positive to big top lug, battery in to solenoid. 10-12 v means bad | solenoid. below 8 go on. 12.8 V | Move negative lead to cylinder head. 10-12 means bad starter ground. Below | 8 go on. 12.7 V | Move negative to car body. 10-12 means bad engine ground strap. else go on. 12.7 V | Move negative to battery. 10-12 means bad main ground cable. Else... 12.6 V | Inspect the two positive cables and clean everything. A common failure | point is the main power distribution junction block. It's a bolt lug with | multiple wires on it beside the battery. Hard to test this particular area | as there are several wires stacked... and a bad connection can happen any | where in the stack. Looking at this job, and considering that it looks like a bad solenoid, I skipped this point... | If the test proves it's either the solenoid or motor itself, try giving | it a good thump. Sometimes a brush will stick during shipping/storage. Gave it as much stick as I could in the severely limited space available. So, if this means I have a bad solenoid, what next? I managed to tap the solenoid a bit, but not much. Thanks to everyone for the help, it is much appreciated. Nick -- Nick Johannessen (nick@sn.no) or (nick@jagweb.com) XJ6 4.2 '70 MOD BRG 5PO "The Beast" XJ6 4.2 '82 Auto 5PO "Wifes car" JagWebs: http://www.sn.no/~nick/jaguar.html & http://www.jagweb.com/ Follow-Ups:
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