Rx-3 electrical help needed
#1
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Rx-3 electrical help needed
I keep blowing the 50A fuse right at the lead off the battery. I've got the factory wiring diagram that leads me to a big box labled Combination meter. WTF is a combination meter and is that prone to failing? I mean a 50A fuse to blow right on contact with power now is a pretty big short. Other then that the car was fine, and this starting happening with no warning at all. I want to get my car running again. Anyone got any ideas.
Thanks.
Thanks.
#4
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disconnect the negative cable and put a test light between the negative post on the battery and the battery cable... it should light up like a spot light (obviously you will need to have the positive cable connected)
then start pulling fuses until the test light goes out... then leave that fuse out and put the others back in and see if the test light comes back on... if it doesn't then at least you narrowed the short to that circuit
*edit* it could be your starter, or alternator or starter solenoid to
then start pulling fuses until the test light goes out... then leave that fuse out and put the others back in and see if the test light comes back on... if it doesn't then at least you narrowed the short to that circuit
*edit* it could be your starter, or alternator or starter solenoid to
Last edited by BASTARD; 02-03-09 at 12:40 AM.
#6
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I've got every circuit disconnected right now and I'm narrow down to the COMBINATION METER. Like I said in the first post. WTF is a COMBINATION METER???
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#8
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that's the problem. I've disconnected the leads into the car. No problem. No fuses are blown in the car so there is no short up to that point either. The problem is between this combination meter and the fuse box. I dont' know what the combination meter is refering to. Is that the amp meter? That's the only thing I can think of, but not sure.
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okies
combination meter, so your rx3 is from 1974 to later (ie ap model)
basically the 50 amp fuse ya blowing is the main fuse for your electrical system.
it runs a white cable with red trace to the ignition switch and the alternator and the secondary fuse box..
the reason its called the combination meter fuse is cause the black box has a shunt under it and the 2 amp fuses (of memory) feed 2 smaller wires running away from the black box to ya amp meter to read the output of the alternator.
now with that explained..
first disconnect ya alternator regulator and see if the fault clears
if it has then reconnect the reg and disconnect the alternator B+ (large white wire with red trace)
as its my guess the alternator or reg has died. by doing that test it will show which one has died.
if the fault doesnt clear at all then start looking down the line to the ignition switch and secondary fuse box under the glove box
hope this helps
combination meter, so your rx3 is from 1974 to later (ie ap model)
basically the 50 amp fuse ya blowing is the main fuse for your electrical system.
it runs a white cable with red trace to the ignition switch and the alternator and the secondary fuse box..
the reason its called the combination meter fuse is cause the black box has a shunt under it and the 2 amp fuses (of memory) feed 2 smaller wires running away from the black box to ya amp meter to read the output of the alternator.
now with that explained..
first disconnect ya alternator regulator and see if the fault clears
if it has then reconnect the reg and disconnect the alternator B+ (large white wire with red trace)
as its my guess the alternator or reg has died. by doing that test it will show which one has died.
if the fault doesnt clear at all then start looking down the line to the ignition switch and secondary fuse box under the glove box
hope this helps
#12
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My car is a February 1973 production car. The 73 wiring diagram shows me a combination meter. I'll do the checks you said though SIM. Thanks for the help and I'll find out tommorrow how it works out. Oh and the car is 100 percent stock. Nothing has been added or altered.
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hi mate,
you will need to upgrade the wiring for the B+
and change the wiring to suit the internal reg of a series 4 alternator.
series 5 alternator has different connections to the series 4 as well..
you will need to upgrade the wiring for the B+
and change the wiring to suit the internal reg of a series 4 alternator.
series 5 alternator has different connections to the series 4 as well..
#16
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Ended up being the alternator. Now trying to decide if I'm going to upgrade or just leave it stock for now. Figure I might as well change the regulator if the alternator went out.
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if the car is stock leave it stock
yes its a good idea to replacve the reg when you replace the alt.
i can get the rx3 reg for $50AUS here brand new. but im sure you could get them cheaper over there.
make sure its an rx3 one as the wiring is different from rx2 and rx4 external regs..
cheers