Hard Cranking When Hot
^^THIS^^ Get a voltmeter and do some checking. You must determine if it's the battery, the cables or the starter, or (gag) something dragging in engine bearings
MOST LIKELY is starter
Get yourself a voltmeter, and if possible a LOAD TESTER, a BIG load tester like one of these. Beg, borrow, etc
You need to figure out where you are losing voltage, if that is the problem, and how much current the starter is drawing. The way you do this with a load tester is to crank the starter enough (few seconds) to get a stable reading on the tester voltmeter. That reading shows how much the starter is dragging down the battery. Then you crank in the carbon pile until the voltmeter matches that same reading, and then read the amperage draw.
This is complicated by the trunk mount. you need as suggested above, to get a long length of no 18 or larger wire to reach from front to back of the vehicle. you can clip one lead to the starter stud, through the meter (voltage) and clip to the battery positive post. Crank the starter and take a reading. You are hoping for a very very LOW reading the lower the better. This tells you if you have excessive drop on the cable.
Do the same with the ground side. Clip to the engine block, run through the meter, go back and clip to the battery NEG post. Crank the starter, read the meter. Same as above. Lower the better.
Most guys on here know I don NOT like "throwing parts" (and money) at a problem. If I have to take a guess, in this case it would be a bad starter
^^THIS^^ Get a voltmeter and do some checking. You must determine if it's the battery, the cables or the starter, or (gag) something dragging in engine bearings
MOST LIKELY is starter
Get yourself a voltmeter, and if possible a LOAD TESTER, a BIG load tester like one of these. Beg, borrow, etc
You need to figure out where you are losing voltage, if that is the problem, and how much current the starter is drawing. The way you do this with a load tester is to crank the starter enough (few seconds) to get a stable reading on the tester voltmeter. That reading shows how much the starter is dragging down the battery. Then you crank in the carbon pile until the voltmeter matches that same reading, and then read the amperage draw.
This is complicated by the trunk mount. you need as suggested above, to get a long length of no 18 or larger wire to reach from front to back of the vehicle. you can clip one lead to the starter stud, through the meter (voltage) and clip to the battery positive post. Crank the starter and take a reading. You are hoping for a very very LOW reading the lower the better. This tells you if you have excessive drop on the cable.
Do the same with the ground side. Clip to the engine block, run through the meter, go back and clip to the battery NEG post. Crank the starter, read the meter. Same as above. Lower the better.
Most guys on here know I don NOT like "throwing parts" (and money) at a problem. If I have to take a guess, in this case it would be a bad starter