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Please Help

nylben

Member
Joined
Sep 15, 2004
Messages
15
Location
Lander, WY
Corvette
1998 convertible
My 1998 manual convertible won't start. This car is driven in Wyoming so it's stored for about eight months a year in a heated garage with a battery maintainer on it. The car has a little over 90k miles on it and has a Optima Red Top that is about four years old. I did a load test and the battery showed a drop from 12.6v to 10.8v, and my meter shows 12.6 volts at the alternator with clean connections on the terminals. I had noticed, this year, that the starter didn't seem to have the same "ummpphh" that it normally had, but it always caught immediately. I always turn on the ignition and let the gauges settle before I start with clutch engaged and the tranny in neutral. Last week I accidentally locked the keys in the car and had to "break into" my car. The theft alarm went off, but I did retrieve my keys and the car acted normally. I drove back home and parked in the garage and had driven the car several times after that. My wife and I took the car to the grocery store and when we came out and tried to start the car it acted like it had a dead battery - clicked, but no fire. We pushed it and dumped the clutch and it started and we drove home. At the present time it's still in the garage and won't even click when I try to start her. All the lights extinguish when I hit the starter, but the memory seat and gauges all read normal, but the instrument cluster is dark. The volt meter reads 12-13 volts. I tried to jump it with my battery charger at 30 amps, but got nothing. I read the DIC codes and got five C1255 - EBTCM Internal Malfunction, B0851 - Battery 1 Out of Range, B2605 - Seat Front Vert. Position Failure, B2606 Seat Rear Vert. Position Failure and U1160 - Loss of Communication with LDCM. I looked all the DIC's up in my shop manuals and none seem to be the cause of my frustration. I put a new OEM alternator on last year and I'm thinking that it's a bad starter - any advice/help would be appreciated. ..
 

Z16#952

Well-known member
Joined
Dec 29, 2013
Messages
344
Location
Bowling Green, KY
Corvette
1958 & 2004 Z06 CE
I would start with the battery. The Optima is great, but when it dies it doesn't want to come back to life. Check your voltage with the key in the crank position. I'll bet it drops right off. If so, swap battery and see if that makes a difference. I have had three Optima Red Tops in the last eight years. Once it dies, bury it. Good luck!
 

nylben

Member
Joined
Sep 15, 2004
Messages
15
Location
Lander, WY
Corvette
1998 convertible
I would start with the battery. The Optima is great, but when it dies it doesn't want to come back to life. Check your voltage with the key in the crank position. I'll bet it drops right off. If so, swap battery and see if that makes a difference. I have had three Optima Red Tops in the last eight years. Once it dies, bury it. Good luck!

I already load tested the battery 10.8 under load so the its not an issue - thanks for your help.
 

Antz81

Well-known member
Joined
Dec 21, 2013
Messages
936
Location
Auckland, New Zealand
Corvette
1981 4 speed
I already load tested the battery 10.8 under load so the its not an issue - thanks for your help.
Amps are more important than volts for starting.
Get the battery properly tested. (Unless you can tell us what the load was in amps)
If that all comes up fine it sounds like an issue at the starter.
 

dadaroo

Gone but not forgotten
Joined
Nov 27, 2013
Messages
530
Location
Columbia, SC
Corvette
2001 Convertibla, Navy Blue and Light Oak
Classic battery issue or a really bad connection in the starter solenoid circuit. I put my money on the battery from what has been posted.
 

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