Electrical - Trailer Wiring & Micro-Relays & Maxi Fuses
88cadillac12Bulletin No. T-89-25
File in Group 8
Number 88
Corp. Ref. No. 818113
Date Oct. 1988
SUBJECT: 1989 NEW PRODUCT INFORMATION - TRAILER WIRING HARNESSES, MICRO-RELAYS, AND MAXI FUSES
MODELS AFFECTED: 1989 DE VILLES, FLEETWOODS, BROUGHAMS, ELDORADOS, SEVILLES, AND ALLANTES
Trailer Wiring Harnesses:
Trailer wiring harnesses are available from GM Service Parts Operations, parts group 7.068, for 1989 Cadillac vehicles as indicated below. It is recommended that these trailering harnesses be used any time it is necessary to connect trailer wiring to one of these vehicles.
P/N P/N To Trailering
Model To Car Trailer Capacity Comments
Brougham 12063385 2987124 5000 lbs. See notes 1 & 2
DeVille 20652621 2987124 1000 lbs.
Eldorado 12085124 2987124 1000 lbs. See note 3
Seville 12085124 2987124 1000 lbs. See notes 3 & 4
Allante N/A N/A 0 lbs. See note 5
NOTES:
1. Wiring harness included with V92 Trailering Provisions.
2. V92 Trailering Provisions required for 5000 lb. capacity.
3. Harness will require two P/N 1626239 relays.
4. No trailering harness is available for Seville STS (-YT6) due to unique rear lamp treatment. Contact Cadillac Technical Assistance for information on STS trailer wiring.
5. Trailer towing is not recommended on Allante.
Parts are currently available from GMSPO.
FIGURE 1 - MICRO RELAYS:
Micro-Relays:
The 1989 Cadillac Eldorados and Sevilles will make use of a new relay. The new relay, referred to as a "Micro-relay", is smaller than the current "ISO" relay, refer to Figure 1, and will become a widely-used part within the next few model years.
On the 1989 Eldorados and Sevilles, Micro-relays are used for the "Twilight Crank" relay and the "Courtesy Lamps" relay. The Micro-relays are taped to the instrument panel wiring channel, just to the driver's side of the Interior Relay Center. The Twilight Crank relay is located above the Courtesy Lamps relay.
Micro-relays are currently available from GM Service Parts Operations as identified below:
Part Part
P/N Group Description
12065118 2.480 Relay - Micro
FIGURE 2 - MAXI FUSES:
Maxi Fuses:
On the 1989 Allante the fusible links located near the battery have been replaced by a new circuit protection device, the Maxi Fuse, refer to Figure 2.
FIGURE 3 - MAXI FUSE LOCATION:
The Maxi Fuse is very similar to a standard Auto Fuse. The major differences are the physical size and the amperage capacity. The Maxi Fuses are located in a small covered fuse block above the battery, refer to Figure 3. They may be serviced by unplugging them from the fuse block and installing a new part.
The Allante uses eight Maxi Fuses. Most of the Maxi Fuses function similar to fusible links in that they supply high power circuits which are then protected by smaller Auto Fuses. Table 1 summarizes the circuits supplied by each Maxi Fuse. Table 2 lists Maxi Fuse part numbers, amp capacity and color.
For warranty purposes use Labor Operation N1720 at .2 hour for replacement of Maxi Fuses.
Maxi Fuse
Number Amps Circuits Protected
1 20 Anti-Lock Braking System
2 20 Fuse 1
Fuse 2 Fuse 3
3 20 Fuse 8
Fuse 9
4 20 ECM Battery Input
PASS KEY Theft Deterrent
5 40 Trunk Pull Down
A/C Blower Motor
6 30 OSM #6, 7, and 13
7 60 Rear Fuse Panel
OSM #2, 3, 4, 5, 9, and 10
8 20 Power Antenna
Bose Amplifiers Cellular Telephone In-Line Fuse
Table 1 - Maxi Fuse Usage
Maxi Fuse
Rating (Amps) Color P/N
20 Yellow 12065931
30 Light Green 12065932
40 Orange 12065933
60 Blue 12065935
Table 2 - Maxi Fuse Part Numbers