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post #1 of 4 (permalink) Old Apr 17th, 04, 05:40 PM Thread Starter
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Location: fontana,wisconsin,usa
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I'm having some trouble. When the engine is hot she barely turns over. I've tried eveything, new starter, shims, distributor. I'm at my wits end. If I take it for a drive and shut it off, I have to wait a half hour before it will turn over good enough to start. When the car is running I have about 13 volts at the battery. Do I have a problem there? I thought I should have around 14 and a half volts. Could this be an alternator problem? Help

68 rs/ss 396-350hp<br />sunny daily driver
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post #2 of 4 (permalink) Old Apr 17th, 04, 08:51 PM
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You are correct, 13.8 to 14.2 volts is considered charging voltage. But keep in mind that at idle, sometimes the alternator doesn't put out as good as it should. Also if there is a bad connection between the terminal block behind the battery and horn relay you can have a similar issue. The regulator will keep the system voltage at spec but a charging battery will be less than the regulated voltage. If this is the case, cleaning the connection, replacing the terminals etc. will get it back. The regulator may also be wimping out on you. Are you using a mechanical regulator?

Once you determine the charging system is up to par you may find you are fighting a heat soak problem. Are you running headers? There are a couple of theories behind heat soaking. One is that the solenoid doesn't fully engage to get the starter to kick in. Another is that the heat causes the winding resistance to increase in both the solenoid and the starter windings making it crank poorly when hot. A heat shield is the usual fix for this. There are also guys who use a ford style solenoid to isolate it from the heat source. But before you get into any of that, make sure the charging system is up to par.

Dave
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68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 4 (permalink) Old Apr 18th, 04, 05:29 AM Thread Starter
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Thanks for the reply.One other thing is that If I put a battery charger on the car will start. Any thoughts?

68 rs/ss 396-350hp<br />sunny daily driver
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post #4 of 4 (permalink) Old Apr 18th, 04, 06:48 AM
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I think you are on the right track then. The electrical system is undercharging the battery. Either due to a bad battery, bad alternator, bad regulator or bad connection. Inspect the connections first from the battery clamp, to the junction block, to the horn relay first. A good way to do this is to take a voltage measurement from the horn relay buss to the positive battery post while the engine is running. You should see less than 0.5 volts or so.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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