ALt Light stays on - Team Camaro Tech
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post #1 of 3 (permalink) Old May 27th, 08, 08:43 AM Thread Starter
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Join Date: Apr 2003
Location: massachusetts
Posts: 10
ALt Light stays on

Hi Gents and Thanks for the advise and reading material over the years. I'm finally getting around and trying to get back on the road in my 67 RS 327. I just put in a new ALtenator and Voltage regulator, & Horn Relay, but it's been so many years and can't remember what I did over the years trying to fix charging problems in this car. I just took the alternator up to Autozone and it bench tested OK according to the machine.

The ALT Idiot light stays on now. I'm not getting the expected 14.7 volts. I do have my Helms manual and have been trying to do some of the tests it outlines. I checked the voltage at the # 4 wire at the regulator with the key on and get 12 volts.

The regulator is mounted with these rubber stand offs. I don't understand why, I thought the regulator needs to be grounded. Is this stock and should I just put a ground wire to the screw with the condenser on it?

The #3 & #4 wire on the regulator has fusable link wires on it. What;s the best way to check these?

The POS bat terminal wire goes to the junction block, but I must have just put a wire to it. I read in one of the postings that this needs to be a fusable link. Can you tell me where I can get one and what should it be rated for?

Is there a way to test the coil? Sorry for so many questions, I'll try to get this resolved befor I move forward with the hide-aways.

Need all the help I can get.
Thanks, Steve

67 RS 327 4sp
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post #2 of 3 (permalink) Old May 27th, 08, 09:05 AM
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Re: ALt Light stays on

You might try here for troubleshooting:

As for the links, they are not rated like fuses. They are rated by their gauge. You should use one gauge smaller (or two numbers) than the wire it protects. So a 10 gauge wire would have a 12 gauge fusible link. You can get them at better auto parts stores (like NAPA).
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post #3 of 3 (permalink) Old May 27th, 08, 09:13 AM
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Join Date: Dec 1999
Location: Yorkville, Illinois USA
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Re: ALt Light stays on

Here's a troubleshooting guide for the charging system:
The voltage checks will verify the fusible links there ands more.

The original battery cables had the fusible link built in. I hoghly recommend the repro spring ring cables. They have the fusible link, they work good, and they look right.

You can do a basic resistance test on a coil pretty easily. You can check the primary resistance by taking all the wires off, and measuring ohms between the 2 small studs, a stock coil is around 3 ohms, a high performance coil is around 1.6 ohms. The center towewr should read connected to the + stud with very low resistance. None of the 3 connections should show any type of connection to ground, resistance should be infinite.

'course, you could always use a jupmer wire to ground the - stud (with the key on run) when you take the wire off, it should make a spark (put an ignition wire with a spark plug on it in the tower, make sure the plug body is grounded, resting on an alluminum manifold or valve cover will do it. DO NOT do this if there is any fuel anywhere!!!).

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